情态动词can的教学反思

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下面是小编收集整理的情态动词can的教学反思(共含13篇),供大家参考借鉴,欢迎大家分享。同时,但愿您也能像本文投稿人“三文鱼”一样,积极向本站投稿分享好文章。

情态动词can的教学反思

篇1:情态动词can的教学反思

情态动词can的教学反思

教学的方式要以教学的任务和内容、学生的年龄特点和心理需求,灵活多变地加以应用。小学生容易注意力不集中,为了引起学生的注意力并激发学生的学习积极性,

在教学情态动词can 的时候,教师画出下列简笔画:

我边画简笔画边说: I can do a lot of things. What can I do? Do you want to know. Let me tell you. I can play table tennis.(画出第一幅图示并鼓励学生说出动词短语:play table tennis) . I can play the piano.(画出第二幅图示并鼓励学生说出动词短语play the piano). I can stand on my head.(画出第三幅图示并鼓励学生说出动词短语stand on my head). 然后我叫了五位学生,让他们做动作来告诉大家。我又问:What can he /she do? 让他们说出:I can…….引出另外五个短语:play football, swim, roller blade, ski,ride a horse.接着让学生根椐学过的动词短语用句型Ican ….I cannot….个自写出自己会做的事情和不会做的事情. 然后让学生利用句型:What can I do? Can you…? Yes, I can.或No I can’t. 互猜彼此会做的.事情和不会做的事情。这样可以让学生所学语言产生兴趣,从而激发学生的学习欲望调动学生的学习积极性。

这样通过大量的、反复的、多种形式的操练,要求学生在量中求质,在速度中求准确。

我认为,为了有效地利用练习的时间,提高练习的效率,教师在组织练习时,要分秒必争,争取在有限的时间内,加大练习的强度和密度。

篇2:情态动词can的教学反思

教学的方式要以教学的任务和内容、学生的年龄特点和心理需求,灵活多变地加以应用。小学生容易注意力不集中,为了引起学生的注意力并激发学生的学习积极性,在教学情态动词can 的时候,教师画出下列简笔画:

我边画简笔画边说: I can do a lot of things. What can I do? Do you want to know. Let me tell you. I can play table tennis.(画出第一幅图示并鼓励学生说出动词短语:play table tennis) . I can play the piano.(画出第二幅图示并鼓励学生说出动词短语play the piano). I can stand on my head.(画出第三幅图示并鼓励学生说出动词短语stand on my head). 然后我叫了五位学生,让他们做动作来告诉大家。我又问:What can he /she do? 让他们说出:I can…….引出另外五个短语:play football, swim, roller blade, ski,ride a horse.接着让学生根椐学过的`动词短语用句型Ican ….I cannot….个自写出自己会做的事情和不会做的事情. 然后让学生利用句型:What can I do? Can you…? Yes, I can.或No I can’t. 互猜彼此会做的事情和不会做的事情。这样可以让学生所学语言产生兴趣,从而激发学生的学习欲望调动学生的学习积极性。

这样通过大量的、反复的、多种形式的操练,要求学生在量中求质,在速度中求准确。我认为,为了有效地利用练习的时间,提高练习的效率,教师在组织练习时,要分秒必争,争取在有限的时间内,加大练习的强度和密度。

篇3:情态动词can用法

作者:候仰龙 刘健

Hi, everyone! I'm “can”. 我是情态动词,没有人称和数的变化,后面跟动词原形。例如:

I can play badminton. 我会打羽毛球。

Mary can play the drums. 玛丽会敲鼓。

那你知道我还经常变脸吗?不信?你瞧:

1. 受到质疑:把can提到主语之前,句末加上问号。例如:

Can he play the piano? 他会弹钢琴吗?

2. 遭到否定:can后加not,缩写成can't。例如:

He can't play the piano. 他不会弹钢琴。

3. 以我开头的一般疑问句的肯定回答为:Yes,主语+can.;否定回答:No,主语+can't.。例如:

- Can you play chess? 你会下棋吗?

-Yes, I can. 是的,我会。(肯定回答)

-No, I can't. 不,我不会。(否定回答)

比较了解我的人这样归纳我的用法:

情动can表能力,和实动不分离。

不管主语何变换,can模样永不变。

只要出现can情动,动词原形后面站。

一般疑问can提前,否定can后not添。

另外,你知道我can主要用于哪些场合吗?

1. 表示能力,“能;会”。例如:

He can speak English. 他会说英语。

2. 表示许可,“可以”,这时可以和may通用,但是比may较正式。例如:

Can I use your pen? 我可以用你的钢笔吗?

3. 表示可能性,“可能会”。例如:

It can't be true. 这不可能是真的。

4. 表示提供帮助。例如:

Can you help me? 你可以帮助我吗?

同学们对我的秉性了解了吗?下面请跟我到第五面“同步练”中去学学变脸术。

篇4:情态动词can有哪些用法

一、用作情态动词

1.表示能力或者能够发生:能,会

I can swim very fast. 我能游得很快。

2.表示知道如何做:懂得,会

She can speak English. 她会说英语。

3.与动词feel, hear, see, smell, taste连用

We can see beautiful flowers there. 我们可以看见那里漂亮的花。

4.表示允许:可以

If you need, you can use my car. 如果你需要的话,你可以用我的车。

5.表示请求允许:可以

Can I use your bike? 我可以用一下你的自行车吗?

6.表示请求帮助:能

Can you help me with this problem? 你能帮我解决一下这个问题吗?

7.用于否定句,表示某事肯定不真实

That can’t be Lucy. She is in the mall. 那不可能是露,她正在商场呢。

8.表示疑惑或惊讶:究竟能,难道会,到底是

What can they be doing? 他们究竟在干什么?

9.表示常有的行为和情形:有时会

The little boy can be careless sometimes. 这个小男孩有时太粗心。

10.表示提出建议:可以

If you like, we can see a film there. 如果你愿意,我们可以在那里看电影。

11.表示对方必须做(生气时):必须

You can shut up or get out. 你给我闭嘴,要不然就滚出去!

二、用作名词

1.金属罐: a can of beans 豆罐头

2.一听:a can of Coke 一听可口可乐

3.装运液体)金属容器、塑料容器:an oil can 油罐

4.牢房,厕所: the can(只有单数形式)

三、用作动词

1.把(食品)装罐保存

2.让…卷铺盖走人,炒…的鱿鱼

在日常学习中,很少遇到can用作名词和动词用法,但我们要熟知其意义及其用法,做到熟练掌握,灵活运用!

情态动词can的用法,绝对没你想象得那么简单!

在英语学习中,情态动词是一个很重要的语法点,其中情态动词can的用法比较常见。多数情态动词在用法上会有几点共通之处,只要掌握好较为常见的情态动词,如can、should等的用法,相信大家在学习其它情态动词时就能做到举一反三,轻松不少。

语法概述

情态动词表示说话人对所说动作的观点,如需要、可能、意愿等。情态动词本身词义不完全,不能单独作谓语动词,必须和实义动词或系动词连用,构成谓语。情态动词can意为“能;会;可以”,其后接动词原形,没有人称和数的变化。

情态动词can的句型结构

1.肯定句

主语+can+动词原形+其他。

例如:He can play football.他会踢足球。

2.否定句

主语+can’t+动词原形+其他。

例如:He can’t play the piano.他不会弹钢琴。

3.一般疑问句

Can+主语+动词原形+其他?

肯定回答:Yes,主语+can. 是的,会。

否定回答:No,主语+can’t. 不,……不会。

例如:Can he play the piano?他会弹钢琴吗?

Yes, he can.是的,他会。

No, he can't不,他不会。

4.特殊疑问句

特殊疑问词+can+主语+动词原形+其他。

例如:What can he do? 他会做什么?

特别提醒:回答can开头的一般疑问句时,通常用“Yes,主语+can.”或“No,主语+can’t.”。有时候说话人为了缓和语气,可以用其他一些词语(如sorry)来作否定回答。

例如:Can he drive?他会开车吗? Sorry,he can’t.对不起,他不会。

篇5:情态动词can有哪些用法

表示能力,意为“能、会”。

例如:Can she speak English?她会说英语吗?

Yes, she can,是的,她会。

表示许可或请求,多用于口语,意为“可以、能”。

例如:Can I use your computer?我可以用一下你的电脑吗?

Of course, you can.当然可以。

表示推测,意为“有可能”;多用于否定句和疑问句中。

例如:Is this book Gina’s? 这本书是吉娜的吗?

No, it can't be hers.

易错辨析

can/could的区别

Can ?一般表示与生俱来的能力?一种客观可能性?可以表示请求或者允许

Could?充当can的过去式?表示请求,语气更委婉。

Can/Could的区别

Can一般表示与生俱来的能力,一种客观可能性,可以表示请求或者允许。

Could充当can的过去式,表示请求,语气更委婉。

阅读过以上内容后,您可以让孩子试着做一做以下几道通关题。

1.听说岳云鹏有一个儿子,这可能是真的吗?

It’s said that Yue Yunpeng has a son. ____ it ____ true?

2.去年我不会游泳,但现在我会了。

I ________ swim last year but I ______ now.

3. 这不可能是我的衬衫,我的是蓝色。

It ______be my shirt, mine is blue.

答案留言在下方评论区,凯兹英语老师会为您解析!

篇6:情态动词can有哪些用法

情态动词must和can

must和can是两个常用的情态动词,你知道它们的用法吗?请观察下面的例句,然后补全结论部分所缺的内容。

【例句】

1. You must be careful when you cross the road.

2. You mustn’t talk loudly in the library.

3. You can play after finishing your homework.

4. You can’t go home now.

【结论】

1. must意为“必须”,用于肯定句中,表示说话人的主观想法,即有必要或有义务去做某事,如例句1;must的否定形式是________,表示“禁止;不要”,语气比较强烈,如例句2。

2. can可以表示允许,意为“可以”,如例句3;can的否定形式是________,表示不允许,意为“不能;不要”,如例句4。

【拓展】

must还可以表示非常有把握的推测,意为“一定”。如:

That shop must be very good. Many people buy things there every day.

can’t还可以表示有把握的否定推测,意为“不可能”。如:

The boy can’t be Ben. He has gone back to his hometown.

【运用】根据句意从括号内选择适当的词语填空。

1. As students, we ________(can / must) study hard all the time.

2. You ________(can / can’t) make any noise because your sister is sleeping.

3. Mum, ________(can / must) I play basketball with my friends after I finish my homework?

4. You ________(must / mustn’t) play football in the street. It’s dangerous.

5. That man ________(can’t / mustn’t) be Mr Green. Mr Green is much shorter.

6. Our English teacher ________(can / must) be working now, because the light in her office is still on.

can和could用法辨析(完美版)

1、can的用法

(1) 表示体力和脑力方面的能力。

He can speak a little English now. 他现在能说一点英语。

(2) 表示对现在的动作或状态进行主观的猜测,主要用在否定句和疑问句中。

(3)表示可能性,理论上的可能性,意为“有时候可能会”,可用于肯定句。

(4)表示允许,意思与may接近。

(5)表示说话人的推测、怀疑、惊异、猜测或不肯定等,主要用于否定句、疑问句或感叹句中。

I wonder if my long lost neighbor can/could still be alive.

我怀疑我失踪已久的邻居是否还有可能活着。Such things can/could and do happen.

这样的事情可能而且确实发生了。

(6)can的特殊句型

cannot…too / enough表示“无论怎么……也不过分”。“越……越好”。

You cannot be too careful to cross the street. You cannot be careful enough to ross the street.

过马路的时候,你怎么小心都不为过。

We cannot put too much emphasis on grammar when learning written English.

学习书面英语时,我们再怎么强调语法也不为过。

(We can neverput toomuch emphasis on grammar when learning written English.)

We cannot put enough emphasis on grammar when learning written English.

学习书面英语时,我们再怎么强调语法也不为过。

I can hardly praise this film too highly.

这部电影评价再高也不为过。

= I can't praise this film toomuch.

= I can't praise this film highly enough.

cannot but+ do sth.表示“不得不,只好”。

I cannot but agree to your decision.

我不得不同意你的决定。

《汉英大词典》

The caves cannot but inspire wonder in the beholder.

这些洞穴让观者无不叹为观止。

2、could的用法

(1) 表示能力,指的是过去时间。

Could she speak English then? 那时候她会说英语吗?

She studied hard but still couldn’t pass the exam.她学习很努力,但是仍然没通过考试。

(2)表示过去一般性允许,指的是过去时间。

注意,表示过去一般性允许(即表示某人随时都可以做某事),用could

When I lived at home, I could watch TV whenever I wanted to. 我住在家里时, 想什么时候看电影就可以什么时候看(一般性允许)

表示在过去某一特定情况下允许进行某一特定的活动,则不用could

He was allowed to see the film yesterday evening. 昨天晚上允许他去看了电影。(特定的允许,不能用could)

表示可能,可以指过去时间,也可以指现在时间,表示语气缓和。

can和could都表示“能”,但can多表允许的能,could多表自身能力的能。

He can drive in this country. 他能(被允许)在这个国家开车。

He could drive in this country. 他在这个国家能(有能力)开车。

We could relax the procedure slightly in your case.

我们可以根据你的情况通融一些。

(3) 委婉客气地提出问题或陈述看法,指的是现在时间。主要用于疑问句,回答时用can。

Could I use your pen?(不知道对方是否借钢笔,很委婉的请求)

Can/could I borrow your thermos?

我可以借用你的暖水瓶吗?

(4) can't /couldn't (与比较级连用,强调某物或某人具备某种特征的程度)太…,再…不过

情态动词+not+比较级 再…都不为过,是一种强调说明,也是肯定语气。

I couldn't be happier.我太幸福了。

The rest of the players are a great bunch of lads and I couldn't be happier.

剩下的选手是一帮很棒的小伙子,我太高兴了。

It couldn't be better.不能再好了/最好的。

I can't agree more.我是最同意的。

但是某些情况下这种结构也可以用作否定含义,作为简单的陈述事实或启使。例如:

He is tired and he can't run faster. 他累得跑不快了。

In some public place,you cant't be too noisy. 在一些公共场所,你不能大声喧哗。

至于什么时候是肯定的强调,什么时候是否定的陈述,就要结合具体的语境了。can't be better! 这再好不过了!

(5)could 真想(强调感觉)

I could kill you! I swear I could!

我想杀了你!我发誓我真想杀了你!

《柯林斯高阶英汉双解学习词典》

I'm so fed up I could scream!

我烦透了,非大喊大叫不可!

3、can与could的区别

can表推测时只用于否定句和疑问句(could无此限制)。couldn’t的可能性比can’t小。

表示建议和忠告,带有一定的礼貌性和客气语气,只能用could :

Could you give me a suggestion about learning english?(你能给我一条学英语的建议吗?)

虚拟语气里面只能用could

If it had not rained so hard yesterday we could have played tennis(本该去打球的,但由于下雨没去)

He could have done this. 他本可以做这个的。

If I could go with you, I should feel very glad.

假如我能同你们一起去, 我会感到非常高兴。

You could have been more considerate.

你本来可以更慎重些。

can't have done, couldn't have done.

前者仍然表示“不可能、没有这种可能性”,后者表示“可能不是,不太可能”

From her knowledge of Douglas's habits, she feels sure that the attacker can't have been Douglas

根据她对道格拉斯习性的了解,她敢断定他不可能是那个袭击者。

《柯林斯高阶英汉双解学习词典》

(对某人未做某事表示恼怒)本来可以 ;本来应该;表示过去有可能做某事但未做

used to show that you are annoyed that sb did not do sth

They could have let me know they were going to be late!

他们要晚来,也该早告诉我一声呀!

I could have won the game but decided to let her win.

我本可以赢得那场比赛,但还是决定让她赢了。

He could have made a fortune as a lawyer.

他本可以当律师挣大钱的。

4、can与be able to的区别

(1) 现在时:无区别,但后者不常用。can是动词原形比较直接,不留余地;could比较委婉,含有一定的感情色彩,有时表示把握不大或犹豫;could用于特殊疑问句常含有惊讶、迷惑等感情色彩。could用于特殊疑问句常含有惊讶、迷惑等感情色彩。

Could I try those shoes on please? 我能试一下那些鞋子吗?

注意:表示给予允许(即自己允许别人做某事), 一般只用can,而could常用在疑问句中(不可用于肯定句中),但是回答要用can

例:Could you please take out the trash ? 你能帮我倒一下垃圾吗?Yes,I can/No,I can't

(2)be able to有完成时;can没有完成时,此时要用have(has,had)been able to。

(3)将来时:can没有将来时,要用will be able to。

(5) 过去时:could表示一般能力,was/were able to 表示在过去某具体场合通过努力成功做成某事的能力。

You’ll be able to get a taxi outside the station.

在车站外可搭乘出租车。

I haven’t been able to get much work done today.

我今天未能干多少工作。

She’d love to be able to play the piano.

她很希望能弹钢琴。

(6) can't be doing with sth

(表示因不喜欢而不愿接受)无法接受某物:

I can't be doing with people who complain all the time.

我无法忍受那些整天发牢骚的人。

篇7:情态动词教学的反思

关于情态动词教学的反思

下面是一篇关于情态动词教学的反思范文,希望对大家有帮助!

读Larsen-Freeman著作Teaching language: From Grammar to Grammaring 是因为张博士的推荐,后来张连中教授寄来的一整套圣智英语教师丛书里也包括这一本,就送一本好基友浩芹先生读,这本书给我的启发很大,过去我认为语言是活的,语法是死的,很不喜欢语法。上大学的时候语法是图书管理员老师教的,学的的转换生成语法,觉得很神奇。读了这本著作以后,我意识到语法也是活的,活在语言运用之中。

今天的这节课,内容是情态动词。这是学生常学常考有常错的一个语法项目。如果将语法书搬过来,一一将用法罗列一番,学生做了很多笔记,写了很多规则,可在实际运用中却有“用不上”“用不对”的情况屡屡发生。怎么能够让学生在语境中学习和使用他们呢?

提出教学目标之后,我先和学生协作写出了像情态动词后面要用动词原形,以及它们的否定形式和疑问形式等基本用法和规则,只用了一两分钟时间,就算交代。

接下来,我提出Do you often play or watch basketball games? Do you know some rules about the game?这样的问题,引入情境,然后然学生四人一组写出3到5个篮球比赛规则。注意使用can/can’’t; must/mustn’t。学生们兴趣盎然,开始讨论并动笔写出一些规则。有一个经常打篮球的男孩子一气写出了7个规则,而且表达非常不错。其余的学生也都陆续写出了几条规则。有的学生使用了使用词典等学习策略,得到表扬。有的学生尽力使用英语进行讨论,得到鼓励;有的学生举手向老师发问,解决问题,同样得到鼓励;有的学生写自己熟悉的运动和球星,是一种学习的自主自觉行为,值得提倡,

接下里,教师引导学生suppose you were a fortuneteller, say three to five things that will/be going to happen to your partner,教室里的气氛一下子被点燃,学生们纷纷转身给同桌“算命”,自然而然地使用了这两个情态动词。展示阶段,一位同学说了一个句子:1. You are going to be asked by our math teacher to answer the questions next class, but you will not do it. 引得大家哈哈大笑。然后他有说 you will be a boss and have a beautiful wife and you will have two or more children逗得大家哄堂大笑起来。但同学们显然深刻地理解了在具体语境中如何使用这些情态动词。将语法巧妙而自然地融入到语境当中,起到了一石三鸟的作用。

这节课,因为是和学生的第一次接触,稍微做了一点相互的'沟通。在操作过程中,一些环节使用的时间扣得不紧,主要是照顾了一些学生的水平。还有一个因素是学生对篮球运动的规则不熟悉,教师也没有能够事先提供一下表达,本来应该让学生先行了解一下规则的表达,譬如走步怎么说,出线怎么说等,这是一个欠缺,做得不到位。同时在fortuneteller部分应该少花点时间,这样就可以完成后面两个练习当中的至少一个:1. You are an adviser on an advice column, and now you need to give some advice on the problem: My father still treats me like a child; 2. Please state three to five things that you could/couldn’t do as children but you can/can’t do now. 后面的两个练习布置成为了课后作业。

整节课来说,课堂气氛活跃,学生表现良好,趣味和知识紧密结合,语法变得不再是枯燥的条条框框,只能靠死记硬背的学习方式得到改观,在语境中理解语法、运用语法的思想得到贯彻。但时间的安排不够紧凑,小组活动效率不高,是值得注意和控制的。

篇8:情态动词can的用法总结

情态动词不是动词,它是助动词的一种,我们可以叫情态助动词,情态动词表达的是语气。因为can是助动词,后面一定接动词原形can do,而can是情态动词,也就是语气助动词。

那到底为什么叫情态呢?这个两个字啊也不好理解。这里我说一下,情态这里其实它的意思是语气,也就是语气助动词是更好的名称。那情态动词表达的是语气,比如说我们有一个情态动词很常见,叫should你应该做某事,you should do that。这就叫强硬的语气。

再比如说 would you go with me?试探性的.问,唉你可以跟我一起走吗?would you go with me?这个时候呢特别害怕别人说啊我不跟你走。would you go with me,这就是一种试探性的语气。

再比如说 could you speak English?这个could you就比这个can you要更加的礼貌,所以同样有一个礼貌的语气。再比如说它还有虚拟语气在里面,比如说I could have been a better student,could have done这里的could就表达的是一种虚拟语气,我本来就可以成为一个更好的学生,这里用的是could。好,总结一下情态动词表语气,它并不是动词,它是助动词,一定要用在动词之前协助着一起成为谓语。它更好的名称呢叫做语气助动词。这就好理解了。又表语气又是助动词,所以情态动词呢更好的说法叫语气助动词。

那接下来,我们重点看一下can到底怎么理解。can呢表示能够嘛,那一定是接动词,因为can是助动词,刚才讲了那一定是接动词,can do一定是动词原形。因为这里涉及到一个助动词的规则,就是但凡出现助动词的话,我任何变形式都变的是助动词,不能再变动词,那这个时候谓语动词就只能用动词原形。

can do something。我能够做某事。那如果说I can swim这个我能够游泳,它表达的是什么样的语气呢?告诉大家表示自信的语气,因为我能够做什么什么事情表达我的能力,这就是一种自信,这种自信的语气展现出来,那就是 I can do something,我能够做某事。can后面一定接动词原形can do,而can是情态动词。也就是说语气助动词。

篇9:情态动词

1) 情态动词不能表示正在发生或已经发生的事情,只表示期待或估计某事的发生。

2) 情态动词 除ought 和have 外,后面只能接不带to 的不定式。

3) 情态动词没有人称,数的变化,即情态动词第三人称单数不加-s。

4) 情态动词没有非谓语形式,即没有不定式,分词,等形式。

篇10:情态动词

情态动词是高考考查的重点语法项目之一,全国17套高考试题对此都有考查。情态动词主要用来表示说话人的看法、态度等,它在英语动词中属于最难把握的一类。

情态动词,属于助动词的一种。首先我们来看看助动词。

概  说

助动词(auxiliary)主要有两类:基本助动词(primary auxiliary)和情态助动词(modal auxiliary)。基本助动词有三个:do, have和be;情态助动词有十三个:may, might; can, could; will, would; shall, should; must, need, dare, used to, ought to. 上述两类助动词的共同特征是,在协助主动词构成限定动词词组时,具有作用词的功能:

1) 构成否定式:

He didn't go and neither did she.

The meeting might not start until 5 o'clock.

2) 构成疑问式或附加疑问式:

Must you leave right now?

You have been learning French for 5 years, haven't you?

3) 构成修辞倒装:

Nowhere can he obtain any information about his sister.

Hardly had he arrived when she started complaining.

4) 代替限定动词词组:

A: Who can solve this crossword puzzle?

B: Tom can.

A: Shall I write to him?

B: Yes, do.

篇11:情态动词

基本助动词与情态助动词最主要的区别之一是,基本助动词本身没有词义,而情态助动词则有自己的词义,能表示说话人对有关动作或状态的看法,或表示主观设想:

What have you been doing since? (构成完成进行体,本身无词义)

I am afraid I must be going. (一定要)

You may have read some account of the matter. (或许已经)

除此之外,情态助动词还有如下词法和句法特征:

1) 除ought和used以外,其他情态动词后面只能接不带to的不定式。如果我们把ought to和used to看做是固定词组的.话,那么,所有情态动词无一例外地只能接不带to的不定式:

We used to grow beautiful roses.

I asked if he would come and repair my television set.

2) 情态助动词在限定动词词组总总是位居第一:

They need not have been punished so severely.

3) 情态助动词用于第三人称单数现在时的时候,没有词形变化,即其词尾无-s形式:

She dare not say what she thinks.

4) 情态动词没有非限定形式,即没有不定式、-ing分词和-ed分词形式:

Still, she needn't have run away.

5) 情态助动词的“时”的形式并不是时间区别的主要标志。在不少场合,情态助动词的现在时和过去时形式都可以表示现在、过去或将来时间:

Would you mind very much if I ask you to do something?

She told him he ought not to have done it.

6) 情态助动词之间是相互排斥的,即在一个限定动词词组中只能出现一个情态助动词,但有时却可以与have和be基本助动词连用:

You should have washed the wound.

Well, you shouldn't be reading a novel.

篇12:情态动词(网友来稿)

Ⅰ知识要点

情态动词本身有词义,但词义不完整,不能单独作谓语,需要在其后接动词原形构成复合谓语,情态动词没有人称和数的变化。

情态动词表示说话人对某一动作或状态的态度。情态动词主要表示能力、允许、必须、批评和推测。一个情态动词可能有多种用法。说话人的某一种态度可能用多个情态动词表示。几个情态动词表示说话人的态度,有时意义相同,有时却有区别,互相不能替代。本讲主要通过情态动词的用法比较掌握其区别。现分七个问题讲解。

一.表能力:(ability)

1. can 只表能力,be able to 表最终产生的能力

She can speak EngLish .

By the time she finishes her courses,shell be able to speak EngLish well .

2. can没有将来时和完成时,要用be able to 代替

She will be able to see you tomorrow .

I have not been able to go to work for three days .

3. could不能表过去实际发生的行为,只表示过去一般 的能力

was (were,had been)able to 则能。意思是 succeed in doing或manage to do

Could not =was not able to

When I was five ,I could already swim .

He could swim,but he didn t jump into the water to save the boy .(没有发生行为)

He couldnt(=wasnt able to )go to London yesterday .(否定式相同)

Some of us can use the computer now but we couldn¢t three years ago .

Einstein was able to leave Germany before the war began .

Although the driver was badly hurt ,he was able to explain what had happened .

(实际发生了行为)

二.表允许:(permission)

1. may ,can (might ,could)

You may (can)go now .=I permit you to go .

Can I have a word with you ?

Could you lend me your camera ?

2. 否定式

may not = must not =can not

注意重音:He may not go tomorrow .(表允许)

=I do not permit him to go tomorrow .

He may not go tomorrow .(表推测)

=It is possible that he will not go tomorrow .

You cannot (mustn t,may not )play football in the park on Sundays ,though you may do

so on weekdays .

You mustnt smoke here.

=You cannot smoke here.

=You may not smoke here.

=You are not allowed tosmoke here.Y

=You d better not smoke here

三.表必须

1. must 表主观上的必须

have to + 原形=have got to + 动词原词形表客观上的必须

I must finish this before I go . (主观)

As we missed the last bus ,we had to walk home .(客观)

You have got to do it today .

2. must没有过去时和将来时,可用have to 表主观

I had to go yesterday .

I shall have to go to my hometown some day .

I have had to go three times already .

但间接引语或有间接引语味道的句子里可用must表过去。

Yesterday morning I told my mother that I must call on a frierd at once .

3. 表暂时必要用must,经常的需要用have to

I must go shopping this morning .

Do you have to go shopping every day ?

I don t have to go to school on Sundays .

4. mustn t 和may not, cannot表示禁止某人做事同义。

You mustn t walk on the grass .(may not )

Cars mustn t be parked in front of the house .(cannot)

5. 表示道义上的必要用ought to

I feel I ought to help you .

There ought not to be much noise in a hospital .

四.表批评:

1.表示对现在动作的批评

should (nt) + ( be )doing (肯定形式表否定意思,否定形式表肯定意思)

You should be reviewing your lessons ,why are you palying chess here ?

She should not be working .She is still very weak .

2. 表示对过去动作的批评

Should (nt) + have done (肯定形式表否定意思,否定形式表肯定意思)

I should have answered your letter soorer,but I have been too busy recently .

You should have taken her home .

You ought to have done the work yesterday .

The child ought not to have been allowed to go alone .

五.表推测 (possibility)

1.表对现在事实的推测:

①表示对现在状态的推测

There must be some tea in the pot ,

She must know several foreign langrages .

The teacher may be in the Lab .

Who might the man be ?

This ought to be your notebook .

The worker cannot be over sixty.(否定式用cant)

Can the news be true ?(疑问式)

How could you be so carless ?

注:①might 不表过去,只表婉转,可能性比 may 小。

② ought to表推测,与must相近,must表强调。

(2).表示对现在动作的推测

They must (may)be waiting for us now .lets hurry up .

It must (may) be snowing outside .

She must (may) still be thinking about the questions you raised .

He cant be watching TV now .He must be reviewing his lessons in the library .

What can they be argurning about ?

2. 对过去事实的推测:

①表示从过去对过去的事实的推测:

He was afraid it might rain that evening .

He could be very excited when he heard some good news .

John said the professor must be at least seventy .

②表示从现在对过去事实的推测:

They must have gone home .

She may (might) have gone to hospital .

She cant (couldnt )have done such a thing. (否定式用cant和couldnt均可)

Where can (could)he have gone ?

Can (could)she have forgatten my address?

3. 表示对将来事实的推测:

It must come sooner or later .

=It surely come sooner or later .

He may come or may not ,I don t know .

- Can he be back before May Day ?

- Im afraid he cant (be back before May Day)

情态动词 + 某些动词(go ,leave )的进行时,表对将来的推测

She may be leaving tomorrow .

I might (may)be going back is the fall .(秋季)

六. need与dare

(一).need和dare用于实义动词的特点是:

1.与其他实义动词一样,有词形变化

The leaves of this plant are yellow because it needs water .

Who dares to go ?

He needed help when he was at college .

She dared to be left alone at home when she was a little girl .

2.构成否定式和疑问式用助动词do

It doesnt need to be explained again .

Does he need to repair the machine at once ?

He did not dare to climb that mountain .

Don t you dare to touch me ?!

3.need接动名词作宾语表被动,接不定式表主动

dare接不定式作宾语,肯定式常接带to的不定式,否定式和疑问式带to与不带to均可。

The young trees need watering (to be watered).(如果接不定式则用被动式表示被动)

We need to discuss the matter carefully .

He dares to ask me that .

I dont dare (to) ask the question again .

Do they dare(to)come ?

(二).need 和dare用作情态动的特点是:

1.与其他情态动词一样,用于各人称、没有词形变化

第三人称单数一般现在时,不加“s”。

I dont believe you need go to shanghai .

Need we hand in the composition today ,teacher ?

No ,you neednt ./ Yes ,you must .(不说need)

The little girl said that she dare not go to town alone .

“If you dare speak to me like that again ,Ill give you a good beating(wipping)”

said the mother .

2. need和dare用于情态动词一般不用于肯定句。need只用于否定句和疑问句,dare只用

于否定句,疑问句和条件句

need的否定式 need not 或 neednt, dare的否定式 dare not 或 darent

不说:I need repair my watch today . 而说: I need to repair my watch today .

不说:She dared speak to a stranger . 而说:She dared to speak to a stranger .

He wanted to come to face me ,but he darent .

You neednt run so fast ,little one !

3. need 和dare用于情态动词,后接不带 to的不定式

He neednt be answered for it . She dare not say what she has just seen .

4. need 和dare接不定式的完成式,可表示过去的时间。

You neednt have told them the secret .

The students darent have asked the teacher when they met .

(三).need 和dare可用作名词

There is no need to start so early .

Mary tried to ride on a cow for a dare .

(四).need 和dare构成固定短语

We must train more experts to meet the needs of the four modernizations .(满足)

We will give you aids if need be .(有必要的话)

We will take steps at once in case of need (必要时)

We have got a great quantity of daily needs( 日用品) in recent years .

How dare you (he )…?“竟敢”“胆大妄为”

How dare you say I¢m unfair ?

How dare you steal apples from my garden!

I dare say, = I think it is likely , perhaps(我看…可能,大概…)

I dare say it will snow today .

I dare say your invention will greatly benifit the whole world .

I dare say sports and games can be of sreat value to people who work with their

brains most of the day .

I dare say you are thirsty after the game .

Itll rain tomorrow ,I dare say .

(五).didnt need to do 表示过去不必做的事,实际未发生动作。

neednt have done 表示做了不必要做的事,确实发生了。

I didnt need to get up early this morning .

So I stayed in bed until lunch time .

I neednt have got up early ,because I had no classes this morning .

You neednt have written such a long composition .

I didnt need to ring the bell ,because the door opened when I got to it .

You neednt have spent so much money ,now we havent got enough money to buy

the tickets.

She didnt need to read those thick books ,which saved him a lot of time .

You neednt have had your radio repaired ,you could have repaired it yourself .

七.“情态动词 + 不定式的完成式”表示一个过去的概念。

1. must have done (对过去情况的推测)

2. may (might)have done (同上)

3. cant (couldnt )have done (对过去情况推测的否定式)

4. could have done .(过去有能力做到的事,由于某种原因没做到)

5. might have done (过去有可能做到的事,由于某种原因没做到)

6. should(not) have done (对过去动作的批评)

7. ought to have done (同上)

8. needt have done (做了过去没有必要做的事)

9. darent have done ( 过去不敢做某事)

He must have arrived in shijiazhuang yesterday .

He may have missed the train .

He might have gone home .

I cant have taken it home .

You should have given him more help .

The wall shouldnt have been painted blue .

You ought to have handed in your composition yesterday .

You neednt have said that .

I darent have asked him when he was born .

Ⅱ高考试题及练习题

1. I didnt see her in the meeting room this morning .

she ____ at the meeting .

A.mustnt have spoken B.shouldnt have spoken

C.neednt have spoken D.couldnt have spoken

2. Where is my pen ? I ____ it .

A.might lose B.would have lost C.should have lost D.must have lost

3. I didnt hear the phone .I ____ asleep .

A.must be B.must have been B.should be D.should have been

4. ____they ____ their work so soon ?

A.Can …have completed B.Must…have completed

C.Should…have completed D.Need…have completed

5. -I saw Ann in the library yesterday .

-You _____ her ;she is still aboad .

A.must not see B.cant have seen C.mustnt have seen D.couldnt see

6. The train has gone .You two ____ on time .

A.should come B.must have come

C.ought to have come D.shouldn t have come

7. The little boys eyes are red .He ______.

A.must cry B.may cry C.must be cried D.must have cried

8. ____ she have lost the watch ?

A.Can B.May C.Need D.Must

9. You ____ your radio .Ive brought one .

A.mustnt have brought B.neednt have brought

C.mustnt bring D.neednt to bring

10. ----Did your sister break that window ?

---- ____ .

A.She must do it B.She may have done it

C.She may do it D.She can do it

11. ---- ____ she have lost her way?

---- She might have .

A.Must B.May C.Could D.Should

12. The ground was wet this morning . It ____ last might .

A.might have been rained B.must be raining

C.must have been rained D.must have rained

13. I parked my car right here but now it s gone . It _____ .

A.may be stolen B.must be stolen

C.must have been stolen D.must have stolen

14. ----We should have walked to the station ;it was so near .

--- -Yes .A taxi ___ at all nesessary .

A.wasnt B.hadnt been C.wouldnt be D.wont be

15. He ___ you more help ,even though he was very busy .

A.might have given B.might give C.may have given D.may give

16. ----Look ,someone is coming, guess ____ .

----Jack.Hes always on time .

A.Who can it be B.Who it can be C.Who he can be D.Who can he be

17. There was plenty of time .She ______ .

A.mustnt have hurried B.neednt have hurried

C.must not hurry D.couldnt have hurry

18. The plant is dead .I ___ it more water .

A.will give B.would have given

B.must give D.should have given

19. You ought ___ to stay here .

A.to allow B.to be allowed C.be allowed D.allow

20. We ___ for her because she never came .

A.neednt wait B.shouldnt have waited

C.mustnt wait D.mustnt have waited

21. Jenny ____ have kept her word . I wonder why she changed her mind .

A.must B.should C.need D.would

22. We ___ last night ,but we went to the coucert instead .

A.must have studied B.might study

C.should have studied D.would study

23. Tom ought not to ___ me your secret ,but he meant no harm .

A.have told B.tell C.be telling D.having told

24. The cat ___ hibernate in winter .

A.does not need to B.needn t

C.doesnt have to D.A or B or C

25. Neither of them ___ the snake .

A.dares catch B.dares to catch

C.dare catch D.A or B or C

26. He ____ have come here yesterday ,but he didn¢t .

A. could B.should C.ought to D.A or B or C

27. ----May I borrow your bike ?

----No ,you ____ .

A.mustnt B.may not C.had better not D.A or B or C

28. He was a good swimmer ,so he ___ swim to the river bank when the boat sank .

A.could B.succeeded C.might D.was able to

29. I got up early that morning ,but I ___ so because I had no work to do .

A.mustnt have done B.didnt need to do

C.neednt have done D.cant have done

30. I ___ up early this morning ,so I stayed in bed until 9 oclock a.m .

A.neednt have got B.didnt need to get

C.shouldnt have got D.cant have got

31. What ___ I do for you ,madam ?

A.shall B.can C.may D.will

32. He ___ see a doctor before it is too late .

A.must B.must have to C.need D.need have to

33. -Could I borrow your dictionary ?

-Yes ,of course you ____ .

A.might B.could C.should D.can

34.---- ____ I stop here sir ?

---- ____ No .Go on to the next paragraph ,please .

A.Will B.May C.Would D.Ought

35. I wasn¢t sure whether I ___ offer to help or not .

A.should B.might C.would D.can

36. ---- ____ we finish all the exersises in class ?

---- Yes ,you ____ .

A.Shall;will B.Need;can C.Can;might D.Must;must

37. ----May I put my bike here ?

---- No ,you ____

A.neednt B.cant C.wouldnt D.arent able

38. I ___ go if I had the chance .

A.can B.may C.will D.would

39. You ___ walk for miles and miles among the hills without meeting anyone .

A must B.need C.may D.have to

40. Our teachers are at work .You ____ make so much noise .

A.won t B.mustn t C.would not D.needn t

41. Im afraid it ___ rain tonight .

A.can B.could C.may be D.might

42. Dont be worried .The news ____ be true .

A.should not B.mustnt C.neednt D.cant

43. You ___ do what you like this morning .

A.could B.can C.are able to D.can be able .

44. ---- Need I start from the beginning ?

---- Yes ,you _____ .

A.need B.do C.can D.must

45. I wouder how he _____ that to the teacher .

A.dare to say B.dare say C.not dare say D.dare say

46. Some warm-blooded animals _____ biberate.

A.need not B.does not need to

C.needn t to D.do not need

47. Somebody _____ here only this morning .

A.must be B.must have been

C.can be D.should have been

48. I ___ them ,but I wasn t able to

A.ought to have helped B.must have helped

C.might help D.needn t have helped

49. You are wet through .You ___ in the rain .

A.must come B.must have caught

C.may catch D.must have got caught

50. He worked hard ,and ____ pass his examinations .

A.could B.is able to C.can D.was able to

Ⅲ 练习答案

1-5 DDBAB 6-10 CDABB 11-15 CDCAA 16-20 BBDBB 21-25 BCADD

26-30 DDDCB 31-35 BADBB 36-40 DBDCB 41-45 DDBDD 46-50 ABADD

Ⅳ 练习题分析

1. couldnt have spoken是对过去情况推测的否定式,可改成cant have spoken , 其他三项

均不能表示推测。

2. must have lost it 是对过去情况推测的肯定式。must可换成may 或might,但可能性

小。must可能性最大。

3. must have been表示对过去情况的推测。 must可换成may 或might .

4. can…have completed表示对过去情况推测的疑问式, can可换成could ,但不能用must,

may 和might构成推测的疑问句。

5. cant have seen 是对过去情况推测的否定式,cant能被couldnt替换。mustnt have

seen 不能表示对过去情况的否定式。

6. ought to have come 是对过去的批评,肯定形式,否定意思,说明你们俩没赶上火车是因

为来晚了。这里的ought to 与 should 同意,可互相替代。

7. must have cried 是对过去情况推测的肯定式。根据是the boy¢s eyes are red 。must

可以改成may 或might 。

8. can she have lost …?是对过去情况推测的疑问句。can 可改成could , 但不能用must ,

may 或might 。

9. neednt have brought 表示过去没有必要做的事,实际做了,但没有带来负作用。根据是

I have brought one 。

10. “She may have done it .”是对过去情况的肯定式,表示可能性较小。D项的 can只用于

疑问句或否定句。A和C项是对将来动作的推测。

11. “Could she have lost …”表示对过去情况推测的疑问句, could可被can所替换,但不能

用Must或May 。

12. must have rained …是对过去情况推测的肯定式。根据是The grourd was wet this

morning 。

13. “must have been stolen”是对过去情况推测的肯定式。根据是I parked my car right

here but now its gone 。

14. “A taxi wasnt at all necessary .”中的谓语动选了过去时。根据是We should have

walked to the station。“should + have + 过去分词”这一结构表示一个过去的概念。

15. “might have given”表示过去有可能做到的事由于某种情况没做成。本题的意思是“既

使他很忙,他还是可以给予你更多的帮助,但实际上并没有做到,这是肯定形式,否定意

思。”

16. 本题的意思是“看,有人来了。猜一猜是谁?”guess之后的who 从句是宾语从句,故用陈

述句的句式。it是从句的主语,是人称代词。it用于人表示搞不清姓别。C项的主语是he

,显然不合实际情况。

17. “neednt + have + 过去分词”这一结构表示做了过去没有必要做的事。根据是There is

plenty of time 。但这并没有坏影响。neednt不能改成mustnt 和couldnt , 因为它们没

有这种功能。

18. should have given 是对过去的批评。树死了是因为我浇水不多。本题意思是我该给

树多浇水,实际并没有多浇水。肯定形式,否定意思。

19. ought to 是情态动词,应接原形动词,但由于allow一词与逻辑主语You成被动关系,故用

be allowed.这称为含有情态动词的被动语态.

20. Shouldnt have waited 表示对过去动作的批评,是婉转的批评,留有余地的批评。否定

形式,肯定意思。

21. Should have kept her word 表示对过去动作的批评,是婉转的批评,有余地的批评。形

式上肯定,意思上否定。

22. Should have studied 表示对过去动作的批评,用法同21题。

23. Tom ought not to have told me…是对过去动作的批评,ought not等于Shouldnt,用法同

20题。

24. 选项A.does not need to hibernate中的need是实义动词,因为does not帮助它构成否定

式;B项neednt hibernate 中的neednt是情态动词,因为其本身构成否定式;C项doesnt

have to hibernate,意为“没有必要…”和A、B两相同意。故三项全正确。

25. 选项A.dares catch中的dares为实义动词,应接带to的不定式作宾语,但由于句首的

Neither构成这句话的否定句。实义动词,dare在否定句中,不定式宾语可以省to;选项

B。dares to catch 中的dares是实义动词,可接带to 的不定式宾语;选项C。dare catch

中的dare为情态动词,其后只能接原形动词,用于否定式,疑问式或条件句。故三项全正

确。

26. 选项A . could have come … 表示过去有能力做到的事,由于其中原因没做成;选项

B。should have come是对过去动作的批评,是婉转的批评,留有余地的批评,肯定形式,

否定意思;选项C。ought to 等should ,用法同选项B。故三项在语法和意思上全成立。

27. 选项A. mustnt和B. may not 表示禁止某人做某事同意。此外,还可以用cant和had

better not 等。

28. could 和 was able to 都表示过去有能力做某事。但could只表示泛指能力,不表示实施

了一个动作。was (were)able to 才表示过去既有能力,也实施了一个动作。本题表示

他的确游到岸边。

29. neednt have done 表示过去没有必要做的事,实际做了,但无负作用。本题的意思是那

天早晨没有必要早起,因为不上班,但实际早起了。

30. didnt need to do sth 是过去没有必要做的事,实际也没有做。

31. What can I do for you 中的can 表示能力,这是服务行业对顾客的礼貌用语。在不同地

方,翻译也不同。在商店,译成“你买什么货?”。在书店,就是“你买什么书?”。这句话不

能用“what do you want ?”代替。

32. 选项A. must表示“必须”,是主观上的“必须”。选项C. need ,用于肯定句,必须是实义动

词,宾语应是to see ,即带to 的不定式。need用于情态动词,只用于否定句或疑问句,不

能用于肯定句,故C项错。

33. 问句中的could 并非是过去式,而是表示委婉,客气的礼貌用语,但回答不能说yes ,you

could 。正确的答语有两种:Yes ,you can 或Yes ,you may。

34. May I stop here 中的May表示允许,还可以用can,但May较多用.但不能用其他各项。

35. might offer 是对将来的推测。must表示可能性最大,但也不是百分之百,may可能性小,

might可能性最小。这里用might的根据是I wasnt sure 和whether。其他各项均无此用

法。

35. might offer表示对将来动作的推测。情态动词must接原形动词,表示对将来的推测时

可能性最大,may表示可能性小,might最小。

36. must表“必须”用于疑问句时,其肯定回答是Yes ,you must,否定回答是No, you neednt;

need表“必要”用于疑问句,其肯定回答用Yes,you must,否定回答用 No,you neednt。

37. May表示允许用于疑问句时,其肯定回答是Yes,you may,否定回答有三种即No,you

may not;No,you mustnt;和No,you cant。还可以说No,you had better not。

38. 本句的would是情态动词用于虚拟语气,因为条件从句中用的是had,用过去时表示对现

在的虚拟。

39. may walk是情态动词接原形动词,表示对将来的推测,但是可能性比must较小,比might

较大些。must表示可能性较大,又与实际不相附。

40. mustnt make so much noise是不允许某人做某事,原因是Our teacher is at work。禁

止某人做某事还可用may not 和can not。不能用neednt。

41. might rain tonight是对将来的推测,表示可能较小用might,这是由Im afraid所决定的。

42. Cant be true表示对现在状况推测的否定式,其他三项均无此种用法。

43. can do what you like中的can不表能力,而表允许,和may的用法相同。

44. 由need构成的疑问句,其肯定回答是Yes,you must,否定回答是No,you needn t。

45. D为正确答案。dare一词既可以作情态动词,也可以作实义动词。作情态动词,后接原

形动词,作实义动词,后接带 to的不定式。dared say应发生在wonder之前,这就否定了A

和B项。全句的含义是“我不知道他怎么敢跟老师说那话。”

46. need一词既可作情态动词,也可作实义动词。作情态动词时,后接原形动词,没有人称

和数的变化。作实义动词时,后接带to的不定式作宾语。B项的数不对,C项多了to,D项

少to,故A为正确答案。

47. must have been here是对过去情况的推测,因为this morning为过去时间状语。

48. I ought to have helped them中的ought to 等于should,表示过去动作的批评。用ought

to表示道义上我应帮助他们,但由于某种原因没办成。

49. must have got canght中的got与been同义。be caught in the rain表示被雨淋,原因是

You are wet through。

50. could与was able to都能表示过去能力,但could只泛指有能力,不表示实际发生的行

为。而was able to 却能表示实际发生的行为,相当succeeded in doing。

篇13:考研英语:语法(情态动词-can,could)

考研英语:语法大全(情态动词-can,could)

情态动词――can, could

can和could

can的词义

表示体力或脑力方面的“能力”或客观上的“可能”。如:

Can you ride a bike? Yes,I can.你能骑自行车吗?是的,我能骑。

Can Mr. Smith use chopsticks? No,he can't .史密斯先生会用筷子吗?不,他不会。

Most women here can read and write now.这里的多数妇女都能识字,也会写字。

In China even barren mountains can be turned into fertile fields.在中国,荒山也能变成良田。

can用在否定句和疑问句中时

在这种句子中,can常可意谓“可能”,表示猜测和推理。如:

It surely can't be six o'clock already?不可能已经六点钟了吧?

You can't be hungry so soon,Tom. You've just had lunch.顿姆,你不可能饿得这么快,你刚吃过午饭。

She cannot be so careless.她不可能这么粗心。

Where can he be?他会在什么地方呢?

What can he mean?他会是什么意思呢?

It surely can't be six o'clock already?不可能已经是六点钟了吧?

注一:can加动词的进行时态,也可表示“可能”。如:

What can he be doing all this time?他一直会是在干什么呢?

She cannot be playing ping-pong now.她现在不可能在打乒乓球。

注二:在日常会话中,can可代替may表示“允许”,may比较正式,如:

You can drop in any time.你随时都可以来串门。

Can I use your basin? of course,you can.我可以用你的脸盆吗?――当然可以。

You can have my seat,I'm going now.我要走了,你坐我的座位吧。

Could

could是Call的过去式,表示与过去有关的1)能力和2)可能(在否定和疑问句中)。如:

1)We were sure that he could do the work.我们肯定他能做这工作。

He was a farmhand. He could not afford to send his son to school.他是个雇农,他供不起儿子上学。

2)At that time we thought the Story could not be true.那时我们以为所说的事不可能是真的。

注: could可代替can表示现在,但语气较为婉转。如:

could you wait half an hour?请你等半个小时好吗?

could you please ring up again at six?六点钟请你再来电话好吗?

could we visit a kindergarten? I've been wanting to see one ever since I came to China.我们可以访问一个幼儿园吗?我自从到中国来以后,一直想看一所幼儿园。

注二:表示过去的能力并已完成一具体动作时须用were (was) able (to),不可用could.如:

I am glad we were able to catch the train.我很高兴我们能赶上火车。但如未完成一具体动作,则可用could not.如:

I am sorry we couldn't (或weren't able to) catch the train.我很遗憾我们没有能赶上火车。

can的形式

can只有现在式can和过去式could两种形式,能表示现在一般和过去一般两种时态,有时也能表示将来。所有其他时态(包括将来)须用be able加动词不定式来表示。如:

With their help, we shall be able to finish the work in a few days.有他们的协助,我们将会在几天之内完成这项工作。

They have not been able to come to Boston.他们没有能到波斯顿来。

Mr. Johnson rang up just now to Say that he won't be able to come over this evening.约翰逊先生刚来电话,说今天晚上他来不了。

can,could用于否定或疑问句中

can (could)用于否定或疑问句中后面跟动词原形的完成式时,表示对过去发生事件的“可能性”。而could较can更加表示说话人的“不肯定的.”语气。如:

Can he have left already?他会是走了吗?

Could she have forgotten my address?她会把我的地址忘记了吗?

It couldn't have been henry. He has gone to the factory.不可能是亨利,他已经去工厂了。

Surely she can not have arrived so early.他当然不可能这么早到这里的。

注:could加动词的完成式时,有时表示“过去可能完成但事实上并没有实现的动作”。如:

You could have done the work better.你本来可以做得更好些。(事实上你做得不那么好)

You could have got the early train.你本来可以搭上早班火车的。(事实上没搭上)

情态动词+ have +过去分词

can/could等七组情态动词(人教版 高考复习下册)

情态动词的语法特征

情态动词必须的形成和发展

小升初英语情态动词考点版

《What can you do?》教学反思

大学英语四级语法精要:情态动词

考研英语:语法(情态动词-may,might)

教学反思格式

that后面加什么动词

情态动词can的教学反思(精选13篇)

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