(完整版)If和whether的区别(含讲解+习题+答案)

合集下载

初中英语if和whether用法区别

初中英语if和whether用法区别

if和whether用法whether和if都可作宾语从句的引导词,意为“是否”,在一般情况下可以互换。

if多用于口语和非正式文体中,whether则多用于比较正式的文体中.例如:I don’t know if/whether it is going to rain。

我不知道是否会下雨.在下列六种情况下,只能用whether,不能用 if:1.在带to的动词不定式前。

例如:She hasn’t decided whether to go or not.她还没有决定去还是不去.2。

在介词后面。

例如:I'm thinking of whether we should go fishing.我在想我们是否该去钓鱼。

I'm not interested in whether she’ll come or not。

她来不来,我不感兴趣。

3。

直接与or not连用时。

例如:I can't say whether or no the will come on time。

他能否准时来,我说不准。

I don't know whether or not they will come to help us.我不知道他们是否会来帮助我们。

4。

在动词discuss后面的宾语从句中。

例如:We discussed whether we had a sports meeting next week.我们讨论下周我们是否举行运动会。

5。

宾语从句提前时只能用whether。

例如:Whether this is true or not,I can't say。

这是不是真的,我说不准.6。

引导位于句首的主语从句或表语从句用 whether.例如:Whether he is right or wrong is a question。

他是对还是错仍是个问题。

The question was whether he went there last night。

最新whether和if的用法区别

最新whether和if的用法区别

whether和if的用法区别whether与if作“是否”讲,在用法上有相同之处,也有不同之处。

一、相同之处。

1.whether和if都能引导宾语从句,常置于see,ask,learn,tell,wonder,doubt,find out等动词之后。

如:He asked me whether/is I could help him. I want to know whether/if he lives there.2.whether和if都可用it作形式主语从句中。

如:it's uncertain whether/if he'll come this evening.3.在be uncertain/doubtful之后,常用whether引导宾语从句,有时也可以用if,如:We are uncertain whether/if Mary will come.二、不同之处。

1.whether可置于句首引导主语从句,而if不能。

如:___the 2000 Olympic Games will be in Beijing is not known yet.A.whetherB.IfC.WhetherD.That 答案是C。

2.whether可用在介词之后,引导宾语从句,而If则不能。

如:Success depends on whether we make evough effort.3.whether可引导表语从句,if则不能。

如:The puestion is whether it is not worth doing.4.在名词之后引导同位语从句时,用whether而不用if。

如:The question whether the students answered correctly should be decided by the teacher.5.whether后可接不定式,而if不能。

2024年初中英语语法易错点辨析之if与whether的用法区别

2024年初中英语语法易错点辨析之if与whether的用法区别

2024年初中英语语法易错点辨析之if与whether的用法区别If作为连词,可以引导条件状语从句和让步状语从句。

在条件状语从句中,如果主句用将来时,则if从句用现在时表示将来;在让步状语从句中,if表示“即使是”或“虽说”。

举例来说:If you go to the party, you will have fun.(如果你去参加派对,你会玩得很开心。

)Even if he doesn't like it, I still think we should do it.(即使他不喜欢,我还是认为我们应该去做。

)另外,if还可以和其他副词或介词搭配使用,比如if only(只要), if only...(要是...), if only I had more time(我要是有更多时间就好了)等等。

whether作为连词,可以引导条件状语从句和让步状语从句。

在条件状语从句中, whether引导的从句使用虚拟语气; 在让步状语从句中, whether引导的从句使用真实语气。

举例来说:I don't know whether he will e or not.(我不确定他是否会来。

)Whether it rains or not, we have to continue with our plans.(无论下雨与否,我们都必须按计划进行。

)另外, whether还可以和其他副词或介词搭配使用,比如whether...or not(是否...), whether it is necessary or not(是否有必要...)等等。

if和whether在英语中都是连词,可以引导条件状语从句、让步状语从句等。

它们在用法上也有一些区别:whether用于条件状语从句,表示“是否”。

而if则用于条件状语从句或主从复合句中,表示“如果”。

例如:I don't know whether he will e or not.(我不确定他是否会来。

中考英语知识点:if、whether的区别

中考英语知识点:if、whether的区别

中考英语知识点:if、whether的区别
中考英语知识点:if、whether的区别
表示是否时,if和whether同义,引导宾语从句,
另外,whether还可以引导主语从句、表语从句(以及同位语从句)等名词性从句或者让步状语从句;
而if还可以表示如果,引导条件状语从句,(主句与从句遵循主将从现的原则)。

如:I dont know if/whether he will arrive on time.
我不知道他是不是会按时到。

I will ring you up if he arrives on time.
如果他按时到达我会给你打电话的。

[注意]下列情况只能用whether不能用if:
①引导主语从句,
②引导表语从句,
③引导从句作介词宾语,
④引导不定式短语,
⑤引导让步状语从句,
⑥在动词discuss之后,
⑦在wonder / not sure之后,
⑧在if与whether含义易混时。

如:Whether it is a fine day next Sunday is still a question. (引导主语从句)
Please ask him whether to go there with a raincoat or not. (作动词的宾语)
Hainan is the place to be, whether its summer or winter. (引
导让步状语从句)
Please let me know whether you need my help. (引导宾语从句)(如果换成if则还可能表示如果你需要我的帮助请告知)。

if和whether的区别

if和whether的区别

/
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。

两者均可用于及物动词后引导宾语从句,表示“是否”,常可互换。

但除此(用于动词后引导宾语从句)之外,在其他情况下表示“是否”时,通常要用 whether 而不用 if,如用于引导主语从句、表语从句、同位语从句、让步状语从句、与or连用分别引导两个分句等,或用于不定式前、用于介词后、直接与 or not 连用等等。

如:
Ask him whether [if] he can come. 问他能不能来。

The question is whether he can do it. 问题是他能不能做。

Answer my question whether you can help him. 回答我你是否能帮助他。

It depends on whether the letter arrives in time. 这取决于信是否来得及时。

注:在某些动词后(如 discuss 等) 通常只用 whether。

如:
We discussed whether we should hold a meeting. 我们讨论了是否要开一个会。

if与whether的区别

if与whether的区别

if 与whether的区别(一)一般情况下可以互换。

If用于口语、非正式文体;whether用于较正式的文体。

(二)只用if不用whether宾语从句是否定句(通过语法形式构成的否定句)Granny asked if the little boy hadn’t broken the glass of hers.The teacher wants to know if Millie hasn’t finished her composition yet.(三)用whether而不用if①从句用作介词宾语时。

I worry about whether I hurt her feelings. I’m thinking of whether we should go fishing.②宾语从句位于句首(表强调)时。

Whether he will come or not, I can’t say.= I can’t say whether / if he will come (or not) .③用于选择疑问句做宾语从句或直接与or not连用时。

I can’t say whether or not he will come.I wonder ed whether or not he would come.I don’t know whether he will choose the blue one or the red one.④与动词不定式连用时。

He hasn’t decided whether to go by bus.⑤if可能产生歧义时。

Tell me if you want the book. (两种解释)Tell me whether you want the book.⑥discuss后的宾语从句中。

We discussed whether we should close the shop.。

宾语从句if和whether的区别和用法

宾语从句if和whether的区别和用法宾语从句是指在主句中充当宾语的从句。

if和whether都可以引导宾语从句,但它们在用法上有一些区别。

1.引导词的意义上的区别:- if通常翻译为“如果”,用于表示条件,带有一个条件的意味。

它询问的是是否发生某种情况或事件。

- whether通常翻译为“是否”,用于表示选择或询问是否有某种可能性。

它主要用于宾语从句中的一般疑问句或作为动词宾语的引导词。

2.语法用法上的区别:- if可以用在状语从句、宾语从句和主语从句中,且在宾语从句中可以有条件句的语序。

例如:“I don't know if/whether he will come.” (我不知道他是否会来。

)- whether主要用在宾语从句中,表示两个或多个选项或可能性。

例如:“She asked me whether I prefer tea or coffee.” (她问我喜欢茶还是咖啡。

)需要注意的是,下面两种情况只能使用whether而不能使用if:-在介词后面引导的宾语从句,例如:“I'm not sure about whether he will come or not.” (我不确定他是否会来。

) -在不及物动词后面引导的宾语从句,例如:“They wonder whether it is going to rain tomorrow.” (他们想知道明天是否会下雨。

)此外,如果主句有助动词或情态动词,那么在宾语从句中只能使用whether。

例如:“They want to kno w whether he can speak Spanish.” (他们想知道他是否会说西班牙语。

)总之,if更偏向于表示条件,而whether更偏向于表示选择或可能性。

在实际运用中,根据句子的具体语境和需要选择合适的引导词。

wether与if区别)

whether 和if区别一、whether和if都可以用作连词,引导一个名词性从句,表示“是否”。

whether可以引导主语从句、表语从句、宾语从句和同位语从句;而if只能引导宾语从句。

1.引导宾语从句既可以用whether,也可以用if,两者常可以互换。

whether从正反两个方面提出疑问,选择意义较强,多用于正式文体中;而if多用于口语,比较强调单方面,如:He asked me whether / if I could lend him my bike.Could you tell us whether / if it snows in winter in Australia?I want to know whether / if you can come or not.She asked them whether / if they had gone there by car or by train.值得注意的是:①whether 和if都可以和or not连用,但是whether之后可以直接跟or not,而if 则不能,如:I don’t care whether or not your car breaks down.I don’t know whether or not he’s coming.但是不可以说:I don’t care if or not your car breaks down.②whether引导的从句一般不可以为否定结构(选择问句的后一部分除外);而if则可以跟否定结构,如:I don’t care if she doesn’t come.I don’t care if it doesn’t rain.但是,在某些动词或形容词之后,则可以用whether引导一个否定结构的句子,这种结构往往表示肯定的含义,如:I wonder whether he doesn’t think too much of himself.其意思相当于:I think he does think too much of himself.③在个别动词之后,如discuss 等,只跟用whether引导的宾语从句,如:They discussed whether they should close the shop.We discussed whether Mary could join us.④whether 可以引导从句作介词的宾语,而if则不能,如:I’m not interested in whether they’ll go or not.It depends on whether we have got enough money.⑤whether可以直接跟动词不定式连用,而if则不能,如:I didn’t know whether to laugh or to cry.She hasn’t de cided whether to go or not.He was wondering whether to go home or stay at school.2.引导主语从句(包括从句在句首的位置)应当用whether,不用if,如:Whether it is true remains a problem.Whether he can stay with us is another matter.Whether he will come, I am not sure.Whether or not he did it, I cannot tell.3.引导表语从句用whether,不用if,如:The question is whether you should accept it.The question is whether he will speak at the meeting.4.引导同位语从句用whether,不用if,如:The question whether he’ll attend the meeting is essential.I am in doubt whether I should agree to the plan.二、whether 还可以引导让步状语从句,意为“不管;无论”;而if则不能引导这种从句,如:I shall tell her about it whether you agree or not.Whether or not the figures are accurate, we have to recheck them.Whether or not we had a baby, we could not survive just on my salary.三、if还可以引导条件状语从句,意为“如果;假如”,而whether则不能引导这种从句,如:We shall do this experiment if we have time.四、如果在从句中使用if表示“是否”容易与表示条件的状语从句混淆时,应注意避免使用if,例如:Please let us know if they are coming. 这句话可以理解为“如果他们要来,请通知我们一下。

if和whether的区别和用法

if 和whether的区别和⽤法
if 和 whether 在中考和⾼考中都考,但学⽣朋友容易搞错,因为这两个词都可以解释为“是否”,那到底怎么区别呢?
1、搭配or 时只能⽤whether
It doesn’t matter whether he will come or not.
他来不来⽆所谓。

2、引导主语从句时只能⽤whether (在句⾸)
Whether the meeting will be postponed has not decided yet.
会议是否要被推迟还未做出决定。

3、作介词宾语是只能⽤whether
He is worried about whether he has passed the interview.
他在担忧是否通过了⾯试。

4、在be动词后作表语时只能⽤whether
The problem is whether we can get the financial support from the government.
问题是我们能否得到政府的财政⽀持。

5、不定式to do 前须⽤ whether
I don't know whether to resign my job now.
我不知是否现在辞职。

whether 和 if的区别

1、引导宾语从句在引导宾语从句时,whether 和if 通可以互换,在ask,care,doub,know,learn,msee,tell,try,wonder等动词之后尤其如此。

例如:I don‟t know if/whether I can help you.They don‟t care a bit whether my reports are good or bad..I wonder if you can examine him now.(高一册第十四页)I am not sure if/whether I‟ll have time.但是,必须注意以下几点:1)如果从句是否定结构,则用if不用whether.例如:Well,think,and see if the most religious people aren‟t those who fell that this life doesn‟t gice t hem all they want.好,你想,那最虔诚的宗教徒,是不是就是那此觉得这现实的人生没有完全满足自己欲望的人?Dinner was almost over when Dan,still looking hungry,grinned and asked Dave if he wasn‟t g oing to have some bread.晚饭快吃完的时候丹(他看上去还没吃饱)笑着问戴维还要不要吃些面包。

I don‟t care if he doesn‟t show up .他来不来我都不在乎。

Let me know if you can‟t meet me at Jackson and Throop Streets Wednesday afternoon at two o‟clock.星期三下午奉告警方,你是否能在杰逊街和思鲁街的黑心角来跟我相会。

(<嘉莉妹妹>=当然,对某些句子,人们可能会有不同的理解。

  1. 1、下载文档前请自行甄别文档内容的完整性,平台不提供额外的编辑、内容补充、找答案等附加服务。
  2. 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
  3. 3、如文档侵犯您的权益,请联系客服反馈,我们会尽快为您处理(人工客服工作时间:9:00-18:30)。

If 和whether的区别 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. 值得注意的是: if还可以引导条件状语从句,是\"假如;如果\"之意,而whether可以引导让步状语从句,是\"不管;无论\" 之意.如: If you ask him, he will help you. I shall go, whether you come with me or stay at home. 一、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. 二、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 . 三、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 专题 1) I don't care __________your car breaks down or not. 2) This depends upon _________we are determined to do it. 3) It depends on _________he is ready. 4) I am not interested in _________you'll come or not. 5) We haven't settled the question of __________we'll renew our supplies of coal for factory.

6) He doesn't know _________to stay or not. 7) I am not sure ___________I'll have time to go with you. 8) She doesn't know __________to get married now or wait. 9) I don't know _________or not they will come for our help. 10) We discussed__________ we should make a change in our plan. 11) He considered__________ he shouldn't tell her the secret. 12) It is unknown _________he will come. 13) I don't know _________they will come to help us. 14) I am not certain___________ the train will arrive on time. 15) ____________the news is true remains a question. 16) What we want to know is ___________he will come to speak to us tomorrow.

17) The question is ___________they can take our advice. 18) Let me know _____________you can’t meet me at Jackson and Throop Streets Wednesday afternoon at two o’clock.

19) We were discussing __________we should discuss the business with them.

20) The question __________we'll build another lecture hasn't been settled. 21) The question ____________he'll come is unknown. 22) Tell me__________ it is not going to rain, please. 23) I don’t care ________he doesn’t show up. 24) Please let me know __________you intend to come. 25) Let me know ___________he has left for Shanghai.

1) if/whether 2) whether 3) whether 4) whether 5) whether 6) whether 7) whether/if 8) whether 9) whether 10) whether 11) if 12) whether 13) whether/if 14) if/whether 15) Whether 16) whether 17) whether 18) if 19) whether 20) whether 21) whether 22) if 23) if 24) whether 25) whether

相关文档
最新文档