下面小编给大家整理的宾语从句if 和whether 的用法区别（共含6篇），希望大家喜欢!同时，但愿您也能像本文投稿人“lingchen009”一样，积极向本站投稿分享好文章。
if和whether用法：
一、if和whether都可译为“是否”，二者引导宾语从句时通常可以互相替换，口语中多用if代替whether。例如：Ask if/whether he plans to come to the meeting. 而以下几种情况中, 只能用whether:
1、强调两方面的选择，特别是句中有or not时。如： Let me know whether you can come or not.
2、宾语从句前置时。如： Whether this is true, I can't say.
3、引导主语、表语、同位语从句时。如： Whether the football game will be played depends on the weather. （主语从句）
The question is whether he can do it. （表语从句）
The question whether we should go with them must be decided at once. （同位语从句）
4、在介词之后作介词的宾语时。如： I haven't settled the question of whether I'll go back home.
5、在不定式前与不定式一起组成词组时。如： Whether to go or stay is still a question.
6、在discuss, decide 等动词后作宾语时。如： We discussed whether we should go there by plane.
二、if或whether引导宾语从句时，作“是否”讲，常放在动词ask 、see 、say 、know和find out等后面。一般情况下，两者常可换用，在口语中多用if。如：
例1 Nobody knows whether (if) it will rain tomorrow. 没有人知道明天是否下雨。
例2 Lucy asked whether (if) they had a cotton sweater .露西问他们是否有棉制的羊毛衣。
三、if或whether引导宾语从句时，要注意三个方面，即连词、语序和时态。
1、if或whether不能和that 或其它连词（副词）同时使用，也不能省去。如：
例3我不知道他今天是否会来。
[误] I don’t know that if(whether) he will come here today .
[正] I don’t know if(whether) he will come here today .
例4他走过来看看猫是否出了毛病。
[误] He came to see what if (whether) there was wrong with his cat .
[正] He came to see if (whether) there was wrong with his cat .
2、if或whether引导的宾语从句时，虽具有疑问意义，但从句语序应用陈述句语序。如：
例5 Did you know the way to the hospital ? The old woman asked me .
The old woman asked me .if (whether) I knew the way to the hospital .老妇人问我是否知道去医院的路。
3、if或whether引导的宾语从句应和主句的时态保持一致。即主句为一般现在时，从句用任一种时态；主句为一般过去时，从句则用过去时中的`任一种时态。如：
例6 I don’t know if (whether) he has come here . 我不知道他是否来过这儿。
例7 Tom asked if (whether) I had read the book . 汤姆问我是否看过这本书 。
四、if和whether的区别：
1、在动词不定式之前只能用whether 。如：
例8 I can’t decide whether to stay. 我不能决定是否留下。
2、在whether …… or not 的固定搭配中。如：
例9 I want to know whether it’s good news or not . 我想知道是否是好消息。
3、在介词后，只能用whether。如：
例10 His father is worried about whether he lose his work . 他的父亲担心是否会失去工作。
4、宾语从句放在句首表示强调时，只能用whether 。如：
例11 Whether they can finish the work on time is still a problem . 他们是否能准时完成这项工作还是个问题。
5、用if会引起歧义时，只用whether。如：
例12 Could you tell me if you know the answer ?
这句话有两种意思：“你能告诉我是否知道答案吗？”或“如果你知道答案，请告诉我，好吗？”。如用whether可避免歧义。
if和whether都可译为“是否”，二者引导宾语从句时通常可以互相替换，口语中多用if代替whether。
强调两方面的选择，特别是句中有or not时。
if或whether引导宾语从句时，作“是否”讲，常放在动词ask 、see 、say 、know和find out等后面。一般情况下，两者常可换用，在口语中多用if。
if或whether引导宾语从句时，要注意三个方面，即连词、语序和时态。
由that, which, who和whom引导的`定语从句：
1.关系代词that引导的定语从句。that在从句中作主语或宾语，可以指人，也可以指物。
如：A plane is a machinethatcan fly. (作主语，指物)
That’s is the best hotelthatI know. (作宾语，指物)
Who is the manthatis reading a book over there? (作主语，指人)
The girlthatwe saw yesterday is Jim’s sister. (作宾语，指人)
2.关系代词which引导的定语从句。which在从句中作主语或宾语，只可以指物。
如：They planted some treeswhichdidn’t need much water. (作主语，指物)
The fishwhichwe bought this morning were not fresh. (作宾语，指物)
3.关系代词who和whom引导的定语从句。who和whom只可以指人，分别在从句中作主语或宾语，口语中通常用who代替whom。
如：The boywhobroke the window is called Tom. (作主语，指人)
The person towhomyou talked just now is Mr Smith. (作宾语，指人)
宾语从句
用作宾语的从句叫做宾语从句。
引导宾语从句的词有：连词that, whether, if；连接代词who, whose, what, which；连接副词when, where, how, why等。
如：I doubtwhetherhe will succeed.
I wonderwhathe’s writing to me about.
I’ll tell youwhyI asked you to come.
注意：
1.宾语从句既可跟在及物动词后面，也可跟在介词后，还可跟在形容词后。
如：I don’t knowwho all the people are.
Please find outwhen the ship sails for New York.
He was afraidthat the other kids would laugh at him.
2.当宾语从句后有宾语补足语时，则需要用it做形式宾语，而将宾语从句后置。
如：I finditstrangewhat she said at the meeting.
We have madeitclearthat we will learn to deal with various difficult problems.
宾语从句例句详解
1. that引导
We believe that he is honest.我们相信他是诚实的。
The doctor insists that I give up smoking医生坚持要我戒烟。
I suggest that we should go tomorrow.我建议我们明天走。
I suggested that we should go the next day.我建议我们第二天走。
We learnt from his letter that he was in Spain.从他的信里我们了解到他在西班牙。
The seller demanded that payment should be made within five days.卖方要求5日内付款。
2. whether / if引导
I don’t know whether he’ll arrive in time.我不知道他是否能及时到。
I didn’t know whether they liked the place.我不知道他们是否喜欢这个地方。
I’ll see whether I can induce him to accept it.我要看看我是否能劝他接受。
I asked her whether she agreed.我问她是否同意。
He enquired if her parents spoke Spanish.他问她父母是否讲西班牙语。
I wonder if it’s large enough.我不知道它是否够大。
She didn’t say if he was still alive.她没说他是否还活着。
3.连接代词引导
I don’t know who [whom] you mean.我不知道你指谁。
Please tell me which you like.告诉我你喜欢哪一个。
I’Il do whatever I can do.我将做我所能做的事。
You can take whichever you like.你爱拿哪个就拿哪个吧。
We’ll do whatever we can to save him.我们将尽我们所能来挽救他。
Take whichever seat you like.你要坐哪个座就坐哪个座位。
Give it to whoever you like.你把它爱给谁就给谁。
You don’t know what you are talking about.你在说什么，你自己也不知道。
Tomorrow at this time we’ll know who is elected.明天这时候我们就会知道谁当选了。
4.连接副词引导
He asked why he had to go alone.他问他为什么必须一个人去。
You don’t know when you are lucky.你身在福中不知福。
I asked how he was getting on.我问他情况怎样。
He knows where they live.他知道他们住哪里。
Have you found out how wide the ditch Was?你了解到那条沟有多宽吗?
I’d like to know when they will let him out.我很想知道他们什么时候会放他出来。
We didn’t know why he had answered in that fashion.我们不明白他为什么这样回答。
that引导表示陈述句的'宾语从句，if和whether，whether...or not引导表示“是否”的一般疑问句的宾语从句。
连接代词
连接代词主要有who，whom，whose，what，whoever，whomever，whosever，whatever，whichever等。
连接代词一般指疑问，但what,whatever除了指疑问外，也可以指陈述。
连接副词
连接副词主要有when,where,why,how,whenever,wherever,however等。
通常引导陈述句的.引导词是“that”。
引导一般疑问句的引导词是“if”和“whether”。
引导特殊疑问句的引导词则是众多的特殊疑问代词或疑问副词, what who when 等。
Eg: He asked me if (whether) I was a teacher.
直接引语变成宾语从句。
直接引语：直接引用别人说的话。
间接引语：转达别人说的话。
直接引语变成宾语从句，如果冒号，引号里是陈述句形式，要用“that”引导，同时从句中的人称，时态，指示代词，地点状语等都要发生相应的变化。
一、宾语从句的连接词
从属连词
连接宾语从句的从属连词主要有that,if,whether.
that引导表示陈述句的宾语从句,而if和whether引导表示“是否”的宾语从句.
He told me that he would go to the college the next year
他告诉我他明年上大学.
I don’t know if there will be a bus any more.
我不知道是否还会有公交车.
Nobody knew whether he could pass the exam.
没人知道他是否会通过考试.
连接代词
连接代词主要有who, whom ,whose ,what ,whoever ,whomever ,whosever, whatever, whichever等.
连接代词一般指疑问,但what, whatever除了指疑问外,也可以指陈述.
Do you know who has won Red Alert game?
你知道是谁赢得了红色警报的游戏?
The book will show you what the best CEOs know.
这本书会告诉你最好的执行总裁该了解些什么.
Have you determined whichever you should buy,a Motorola or Nokia cell phone?
你决定好是买诺基亚还是摩托罗拉的电话了吗?
连接副词
连接副词主要有when,where,why,how,whenever,wherever,however等.
He didn’t tell me when we should meet again.
他没有告诉我什么时候我们能再见面.
Could you please tell me how you read the new panel?
你能告诉我怎么用这个新的操作盘吗?
None of us knows where these new parts can be bought.
没有人知道这些的新的零件能在哪里买到.
二、动词的宾语从句
大多数动词都可以带宾语从句
We all expect that they will win , for members of their team are stronger.
我们都预料他们会赢,因为他们的队员更强壮.
He told us that they would help us though the whole work.
他告诉我们在整个工作中,他都会帮忙的.
部分“动词+副词”结构也可以带宾语从句
I have found out that all the tickets for the concert have been sold out.
我发现这场音乐会的所有票都卖光了.
Can you work out how much we will spend during the trip?
你能计算出这次旅行我们将花费多少钱吗?
动词短语也可以带宾语从句
常见的这些词有:
make sure确保 make up one’s mind下决心 keep in mind牢记
Make sure that there are no mistakes in your papers before you turn them in.
在上交试卷前确保没有任何错误.
可运用形式宾语it代替的宾语从句
①动词find,feel,consider,make,believe等后面有宾语补足语的时候,则需要用it做形式宾语而将that宾语从句后置.
I think it necessary that we take plenty of hot water every day .
我认为每天多喝开水是有必要的.
I feel it a pity that I haven’t been to the get-together.
我没去聚会,感觉非常遗憾.
I have made it a rule that I keep diaries.
我每天写日记成了习惯.
We all find it important that we (should) make a quick decision about this mater.
我们都认为对这件事马上做出决定很重要.
②有些动词带宾语从句时需要在宾语与从句前加it
这类动词主要有:hate, take , owe, have, see to.
I hate it when they with their mouths full of food.
我讨厌他们满嘴食物时说话.
He will have it that our plan is really practical.
他会认为我们的计划确实可行.
We take it that you will agree with us.
我们认为你会同意我们的.
When you start the engine, you must see to it that car is in neutral.
开启发动机时, 一定要使汽车的离合器处于空挡位置.
③若宾语从句是wh-类,则不可用it代替
We all consider what you said to be unbelievable.
我们都认为你所说的是不可信的.
We discovered what we had learned to be valuable.
我们发现我们所学到的东西都是有用的.
三、介词的宾语从句
用wh-类的介词宾语从句
We are talking about whether we admit students into our club.
我们正在讨论是否让学生加入我们的俱乐部.
The new book is about how Shenzhou 6 manned spaceship was sent up into space.
这本新书是关于神州6号载人航天飞船是如何升入太空的.
用that,if引导的介词宾语从句
有时候except,but,besides三个介词后可见到that引导的宾语从句
I know nothing about my new neighbor except that he used to work with a company.
对于我的新邻居我只知道他曾在一家公司上班,其他一无所知.
四、形容词的宾语从句
常用来引导宾语从句的形容词有: sure,certain,glad,please,happy,sorry,afraid,satisfied,surprised
I am sure I will pass the exam.
我确信我会通过考试.
I am sorry that I have troubled you so long.
很抱歉我这么长时间在打扰你.
He is glad that Li Ming went to see him when he was ill.
他很高兴在他生病的时候李明能去看望他.
五、if,whether在宾语从句中的区别
① if和whether在作“是否”解时,引导宾语从句常放在动词know,ask,care,wonder,find out等之后,介词后一般不用if
② 少数动词,如:leave,put,discuss,doubt后的宾语从句常用whether.
③ whether后可以加or not,但是if不可以.
④ 在不定式前只能用whether.
(如：I can’t decide whether to stay. 我不能决定是否留下。)
⑤ 避免歧异时,我们常用whether而不用if.
六、哪些宾语从句不可以省略引导词that
当that作learn,suggest,explain,agree,wonder,prove,mean,state,feel,hold等动词的宾语时;
当宾语从句较长时;
当主语状语置于主句尾,宾语从句之前时;
当主语谓语动词(包括非谓语动词)与宾语从句之间有插入语时;
当一个动词带有两个或两个以上宾语从句时,此时第一个that可以省略,第二个that不可以省略;
当宾语从句中的主语是this,that或this,that做主语的定语时;
当宾语从句是双宾语中的直接宾语时;
当宾语从句的主语是非谓语动词或主语从句时;
当主语中的谓语动词是固定词组时;
当宾语从句有it做其先行词时;
在直接引语中,转述分句把宾语从句隔开时.
七、宾语从句的否定转移
主句的谓语动词是think,believe,imagine,suppose,consider,espect,fancy,guess等,并且主句的主语是第一人称而且为一般现在时,从句的否定词一般要转移到主句上来,其反义疑问句一般与宾语从句一致.
I don’t think he will come to my party.而不能说成I think he won’t come to my party.
我认为他不会来我的舞会.
I don’t believe that man is killed by Jim,is he?
我认为那个人不是Jim所杀的,是不是?
如果宾语从句中有某个含有否定意义的形容词或副词,其反义疑问句要用肯定形式.
We find that he never listens to the teacher carefully,does he?
我们发现他从来不仔细听老师讲课,是不是?
八、宾语从句的时态和语序
当主句为现在时或将来时,宾语从句的时态一般不受主句的时态所影响.
当主句为过去时
①从句用一般过去时或过去进行时表示与主句谓语动词动作同时发生
I only knew he was studying in a western country,but I didn’t know what country he was in.
我只知道他当时在西方的一个国家读书,可不知道是哪个国家.
He asked me if I was reading the story The Old Man and the Sea when he was in.
他问我他进来的时候我是否正在读<<老人与海>>.
②从句过去完成时表示该动作发生在主句谓语动作之前
He told me that he had told Mary about the meeting already.
他告诉我他已经把有关会议的事情告诉的了Mary.
③从句谓语用过去将来时表示该动作发生在主句谓语动作之后
The reporter asked if the government would take necessary measures to put down the to-do.
记者问政府是否会采取必要的措施镇压骚乱.
如果从句是一个客观真理,那么从句的时态不根据主句的时态而变化
The teacher said that the moon goes around the earth yesterday.
老师昨天说月亮绕着地球转.
当宾语从句的引导词是who,which,what,when,where,how,why等表疑问时,不能按正常语序安排,经常将这类引导词置于句首
Who do you think the public might choose as their favorite singer this year?
你认为今年公众会选谁为他们最喜欢的歌手.
★ 宾语从句的用法
★ 宾语从句练习题
★ 宾语从句时态
