九年级中考复习：whether和if区别【含答案】

whether和if的常见用法区别
Whether 和if都可以用来对条件进行判断，但两者有一定的区别。

首先，whether 是一个偏正式的词，通常多出现在文学作品中或者口头交流中，主要表示在一个特定条件下有两种可能性，否定（no）或肯定（yes），询问对方有没有某项能力，或者询问某件事发生或者没有发生：
例如：
I wonder whether you can solve this problem.
但是if更通用，尤其是出现在句子中，表示一个条件只有在满足另一条条件的前提下才能被实现：
此外，whether语气往往比if 弱，意思更接近whether…or not 的表达，表示有可能发生或者不发生：
而if语气较强，表达某一条件必须被满足：
综上所述，whether主要用于询问某一条件的可能性；而if则表示满足一定条件是必须的。

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 suppliesof 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 ustomorrow.17)The question is ___________they can take our advice.18)Let me know _____________you can’t meet me at Jackson and ThroopStreets Wednesday afternoon at two o’clock.19)We were discussing __________we should discuss the business withthem.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/whether2)whether3)whether4)whether5)whether6)7)whether8)whether/if9)10)whether11)12)whether13)14)whether15)16)if17)whether18)whether/if19)20)if/whether21)22)Whether23)24)25)whetherwhether27)28)if29)30)31)32)whether34)whether35)whether36)if37)38)if39)40)whether41)42)whether。

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。

由whether,if 引导的宾语从句（一）由whether,if 引导的宾语从句由whether(if)引导的宾语从句，实际上是一般疑问句演变而来的。

意思是“是否”。

宾语从句要用陈述句语序。

一般说来，在宾语从句中whether与if可以互换使用，但在特殊情况下if与whether是不能互换的。

例句：I wonder whether(if) they will come to our party.（二）只能用whether，不能用if引导的宾语从句1.在带to的不定式前：We decided whether to walk there.2.在介词的后面：I’m thinking of whether we should go to see the film.3.直接与or not连用时4.例句：I can’t say whether or not thet can come on time.5.当强调宾语从句并将其提前时只能用whether。

6.如:Whether I'll have time to go with you I am not sure.我很难说我们是否有时间跟你们一起去。

7.当whether和or 连用表示明确的选择时。

8.如:He asked me whetherI wanted to go there by train or by bus.他问我是想乘火车还是坐公共汽车去那里。

9.动词discuss，decide,consider，sure等后习惯上也常用Whether引导从句，不用if。

10.They discussed whether they should leave at once.他们讨论了是否应该马上离开。

11. We discussed whether the house should be sold. 我们讨论了这房子是否应卖掉。

（三）其他只能用whether不能用if的情况1.表语从句用whether引导不用if.如:①The doubt was whether you had broken the beautiful vase. 疑问是你是否打坏了这只漂亮的花瓶。

初中英语中考高频考点词汇whether和if的区别用法whether，if是初中英语中考经常要考查的词汇。

会出现在各种题型中，形式多而杂，这就要求大家必须能很好的理解和运用它们，能区分它们的相同点和不同点。

whether，if这两个连词都作“是否”解，引导宾语从句时，两者通常可以互换。

但是在几种情况下二者又是有区别不可通用的，所以大家要注意区别。

只有多记多背便可熟能生巧，方能运用自如。

但在下列几种情况下，不可用if 代替whether。

1)当whether 与or not连成词组时。

I don't know whether or not they will come for our help。

我不知道他们是否来帮助我们。

2)whether 用在不定式前面时。

She hasn't decided whether to go or not。

她还没有决定去还是不去。

3)whether引导的从句放在句首时。

Whether this is true or not,you can't say。

这是不是真的，你不说(或我说不准)初中英语中考高频考点词happen不同角度使用方法辨析初中英语中考中，有相当一部分词语辨析用法的题型考察。

所以这就需要大家在平时的学习过程中，注意区分一些意思相近的词语的用法。

因为英语中往往意思相近但是用法确有很大不同。

而“Happen”这个词就是一个中考经常考查的一个高频考点词汇。

往往从词语的搭配，主语的使用，发生的性质等方面去考查。

有时还要与take place 一起混搭出现。

所以大家在学习过程中一定要注意其如何使用。

现主要从主语、固定搭配使用、从句的角度来归纳一下happen的使用方法。

用法归纳“happen” 是不及物动词,意为“发生”，其后不能带宾语，它的主语通常是物，而不能是人。

其用法如下:1. 表示“某地(某时)发生了什么事”,常用“sth.+ happen +地点/ 时间”结构表达,此时主语应是事情.如：The story happened in a small village. 这个故事发生在一个小村庄.An car accident happened a moment ago. 刚才发生了一起车祸.2. 表示“某人出了某事(常指不好的事)”,要用“sth.+ happen+to sb.”结构表达。

whether和if的区别有哪些不同whether和if的区别主要有含义不同、用法不同、侧重点不同。

引导宾语从句，一般既可用whether 也可用if，if和whether在宾语从句中，都表“是否”，可换用，if更口语化，whether正式些。

当有or not 时，一般用whether，而不用if。

在强调任意选择时，用whether…or，此时不用if替换whether。

whether和if的区别一、含义不同1、whetherconj. 是否;不管;无论。

2、ifconj. 如果;即使;每当;n. 条件;设想。

二、用法不同1、whetherwhether用作连词，意思是“是否，是不是”，可引导名词从句或动词不定式短语。

whether还可引导让步状语从句，意思是“不管，无论”，从句中通常用一般现代时代替将来时。

2、ifif引导条件状语从句，从句可为真实条件从句,也可为虚拟条件从句。

如为真实条件从句，谓语用陈述语气，表示可能性很大，作“假使”“如果”解,通常用一般现在时代替一般将来时; 如果if从句中用will，表示意愿。

从句如为虚拟条件从句，谓语动词要用虚拟语气，表示可能性不大或与过去事实相反，作“要是,假如”解。

可指过去的情况，也可指现在和将来的情况。

指将来情况时可用were to或should。

三、侧重点不同1、whether意思是“假使，如果”时，whether从句单纯表示事实;whether可以用在介词之后的间接疑问句中;whether可以用在“to+动词原形”的前面;whether可以引导主语、表语从句。

意思是“是否”时，whether多用于书面语中，可与or或or not连用，除引出宾语从句外，还可引出主语从句、表语从句、同位语从句或与不定式连用。

2、if意思是“假使，如果”时，if从句可以表示希望;if不能用在介词之后的间接疑问句中;if不能用在“to+动词原形”的前面;if不能引导主语、表语从句。

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。

If和whether的区别（含讲解+习题+答案）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 forfactory.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 StreetsWednesday 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 ca re ________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/whether2)whether3)whether4)whether5)whether6)whether7)whether/if8)whether9)whether10)whether11)if12)whether13)whether/if14)if/whether15)Whether16)whether17)whether18)if19)whether20)whether21)whether22)if23)if24)whether25)whether。

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）。

由whether,if 引导的宾语从句（一）由whether,if 引导的宾语从句由whether(if)引导的宾语从句，实际上是一般疑问句演变而来的。

意思是“是否”。

宾语从句要用陈述句语序。

一般说来，在宾语从句中whether 与if能够互换使用，但在特殊情况下if与whether 是不能互换的。

例句：I don’t know whether(if) they will come to our party.（二）只能用whether，不能用if引导的宾语从句=I can’t say whether they can come on time or not.我没法说清楚他们是否会按时来。

4.当强调宾语从句并将其提前时,只能用whether。

如：Whether I'll have time to go with you I am not sure.我很难说我们是否有时间跟你们一起去。

5.当whether和or 连用表示明确的选择时。

如：He asked me whether I wanted to gothere by train or by bus.他问我是想乘火车还是坐公共汽车去那里。

6.动词discuss，decide,consider，sure等后习惯上也常用Whether引导从句，不用if。

They discussed whether they should leaveat once.他们讨论了是否应该马上离开。

We were not sure whether the houseshould be sold(or not). 我们不确定这房子是否应卖掉。

（三）其他只能用whether不能用if的情况1.表语从句用whether引导不用if.如：①The doubt was whether you had broken the beautiful vase. 疑问是你是否打坏了这只漂亮的花瓶。

whether和if的区别一、相同之处1．whether和if表示“是否”时，都能引导宾语从句，这时两者可以互换，常置于see，ask，learn，tell，wonder，doubt，find out等动词之后。

如：He asked me whether/if I could help him. 他问我是否我能帮他。

I want to know whether/if he lives there. 我想知道他是否住在那里。

We don’t know whether/if we should go or stay. 我们不知道我们是否该走还是待着。

2．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. 我们不确定玛丽是否会来。

二、不同之处1．whether可置于句首引导主语从句，而if不能；但如果是it作形式主语，则主语从句中可以用if。

如：Whether he will come is not certain. =It is not certain if/whether he will come.他是否会来是不确定的。

（it作形式主语，则后面的从句中可以用if）2．在宾语从句中，如果从句中有or not时，分两种情况：当whether与or not连成一个词组时，whether不可换用if。

She asked me whether or not I could finish the task in a day. 她问我是否能在一天之内完成这项任务。

I don’t know whether or not they will come for our help. 我不知道他们是否会来帮我们。

3．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 enough effort.成功取决于我们是否做了足够的努力。

whether if 区别加习题宾语从句中的whether和if都可以引导一般疑问句的转化，表示“是否”。

但在特殊情况下，只能使用whether，不能使用if。

例如，在带有to的不定式前、介词后、直接与or not连用、强调宾语从句并将其提前、表示明确选择时，只能使用whether，不能使用if。

举例来说，我们可以说“I wonder whether/if they will cometo our party”，但在带有to的不定式前、介词后、直接与or not 连用、强调宾语从句并将其提前、表示明确选择时，只能使用whether，例如“We decided whether to walk there”、“I’m thinking of whether we should go to see the film”、“I can’t say whether or not they can come on time”、“Whether I'll have time to go with you I am not sure”、“He asked me whether I wanted to go there by train or by bus”。

除此之外，表语从句和同位语从句中也只能使用whether，不能使用if。

例如，“The doubt was whether you had broken the beautiful vase”、“The n was whether we could finish the projecton time”。

在动词discuss、decide、consider、sure等后惯上也常用Whether引导从句，而不用if，例如“T hey discussed whether they should leave at once”、“We discussed whether the house should be sold”。

请联系网站删除资料收集于网络，如有侵权whether的区别If 和if,口语中多用是否\,二者引导宾语从句时通常可以互相替换if和whether都可译为屜而以下例如：Ask if/whether he plans to come to the meeting. 代替whether.whether:只能用, 几种情况中如：or not时.1. 强调两方面的选择,特别是句中有Let me know whether you can come or not.如：2. 宾语从句前置时.Whether this is true, I can\'t say.如：3. 引导主语、表语、同位语从句时.（主语从Whether the football game will be played depends on the weather.句）（表语从句）The question is whether he can do it.（同The question whether we should go with them must be decided at once.位语从句）如：在介词之后作介词的宾语时.4.I haven\'t settled the question of whether I\'ll go back home.如：在不定式前与不定式一起组成词组时.5.Whether to go or stay is still a question.如：等动词后作宾语时.6. 在discuss, decideWe discussed whether we should go there by plane.可以而whether之意屜假如；如果屜,值得注意的是：if还可以引导条件状语从句,是 .如：屜不管；无论\ 之意引导让步状语从句,是If you ask him, he will help you.I shall go, whether you come with me or stay at home.know、say 、see 、,作“是否”讲,常放在动词ask 一、if或whether引导宾语从句时如：,在口语中多用if.find out等后面.一般情况下,两者常可换用和没有人知道明天是否下1 Nobody knows whether (if) it will rain tomorrow. 例.雨露西问他们是否有棉2 Lucy asked whether (if) they had a cotton sweater .例.制的羊毛衣. ,要注意三个方面即连词、语序和时态或whether引导宾语从句时,二、if .如：that 或其它连词（副词）同时使用,也不能省去1 if或whether不能和.3 我不知道他今天是否会来例t know that if(whether) he will come here today . '[误]I dont know if(whether) he will come here today . '[正] I don.他走过来看看猫是否出了毛病例4] He came to see what if (whether) there was wrong with his cat . 误] He came to see if (whether) there was wrong with his cat .[正如：,但从句语序应用陈述句语序.引导的宾语从句时2 if或whether,虽具有疑问意义5 Did you know the way to the hospital ? The old woman asked me . 例老妇The old woman asked me .if (whether) I knew the way to the hospital ..人问我是否知道去医院的路从句用,.whether3 if或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只供学习与交流．请联系网站删除资料收集于网络，如有侵权如：,从句则用过去时中的任一种时态.任一种时态；主句为一般过去时. 我不知道他是否来过这儿't know if (whether) he has come here . 6 I don例 . 汤姆问我是否看过这本书例7 Tom asked if (whether) I had read the book .的区别：和whether三、if 如：在动词不定式之前只能用whether .1. 我不能决定是否留下't decide whether to stay. 例8 I can .如：的固定搭配中whether ……or not 2 在. s good news or not . 我想知道是否是好消息例9 I want to know whether it'whether.如：3 在介词后,只能用他的父亲担心是例10 His father isworried about whether he lose his work ..否会失去工作whether .如：宾语从句放在句首表示强调时,只能用4他们是否例11 Whether they can finish the work on time is still a problem ..能准时完成这项工作还是个问题如：,只用whether.5用if会引起歧义时12 Could you tell me if you know the answer ?例,请告诉我?”或“如果你知道答案,这句话有两种意思：“你能告诉我是否知道答案吗. 可避免歧义如用whether好吗?”.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 suppliesof 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.只供学习与交流．请联系网站删除资料收集于网络，如有侵权____________the news is true remains a question. 15)usto come to speak want to know is ___________he will 16)What wetomorrow.The question is ___________they can take our advice. 17)you can't meet me at Jackson and ThroopLet me know _____________18)Streets Wednesday afternoon at two o'clock.withthe business discussing __________we should discuss We 19)werethem.The question __________we'll build another lecture hasn't been settled. 20) The question ____________he'll come is unknown. 21) Tell me__________ it is not going to rain, please. 22).he doesn't show upI don't care ________23) Please let me know __________youintend to come. 24)Let me know ___________he has left for Shanghai. 25)只供学习与交流．资料收集于网络，如有侵权请联系网站删除1)if/whetherwhether 2)whether 3)whether 4)whether 5)6)whether 7)whether/if 8)9)whether 10)11)whether 12)13)whether 14)15)if 16)whether 17)whether/if 18)19)if/whether 20)Whether 21)22)whether 23)whether 24)25)if 26)27)whether 28)whether 29)whether 30)if 31)if32)whether33)whether 34)只供学习与交流．。

if和whether的区别引言在英语中，if和whether都可以用于引导一个名词从句或一个简单句来询问或表示条件。

尽管它们在某些情况下可以互换使用，但对于一些具体的用法和语境，它们之间还是有一些区别的。

本文将详细解释if和whether之间的区别，并提供一些实例来说明它们的用法。

if的用法1.表示条件：if用于引导一个条件从句，表示一个条件可能发生或未发生的情况。

例如：–If it rains, we will stay at home.（如果下雨，我们会呆在家里。

）–I will go to the party if I finish my work.（如果我完成了工作，我会去参加聚会。

）2.带有假设性的情况：if还可以用于表达假设或假设的情况。

例如：–If I were rich, I would travel the world.（如果我富有，我会环游世界。

）–If I had studied harder, I would have passed the exam.（如果我学得更努力，我就能通过考试。

）3.引导间接疑问句：if可以用于引导间接疑问句，询问某事是否可能或是否会发生。

例如：–He asked if I could help him with hispresentation.（他问我是否可以帮他做演讲。

）–I wonder if she knows the answer.（我想知道她是否知道答案。

）whether的用法1.引导选择疑问句：whether通常用于引导选择疑问句，询问两个或多个选择之间的一个。

例如：–I don’t know whether to go to the party or stay at home.（我不知道是去参加聚会还是呆在家里。

）–Could you tell me whether the store is open on Sundays?（你能告诉我星期天店铺是否开门吗？）2.引导宾语从句：whether可以用于引导宾语从句，表示一种选择或询问。

whether和if的区别whether和if都可以引导宾语从句，表示“是否”，在口语或间接引语中两者可以互换使用。

下面由店铺为你分享whether和if的区别的相关内容，希望对大家有所帮助。

whether和if的用法区别1)whether和if常用来引导宾语从句，这时两者的含义区别很小，一般可通用。

例如：①I don't know whether/if they will come to help us. 我不知道他们是否来帮助我们。

②I am not sure whether/if I'll have time to go with you. 我很难说我们是否有时间跟你们一起去。

上面两句无区别。

但是，当whether与or not连成一个词组时，whether不可换用if。

例如：③I don't know whether or not they will come for our help. 我不知道他们是否要来求我们支援。

【注意】若whether和or not不连在一起，在口语中可以用if取代whether，当然也可以用whether。

例如：④I am not certain if/whether the train will arrive on time. 我没有把握火车是否准时到达。

⑤I don't care if/whether your car breaks down or not. 我不在乎您的车是否是会出故障。

whether和if的区别还有三种情况值得注意：(1)在介词后面只能用whether，不能用if。

例如：①This depends upon whether we are determined to do it. 这件事要看我们是否有决心去做。

②It depends on whether he is ready. 这件事要看他是否有准备。

③I am not interested in whether you'll come or not. 你来不来我不感兴趣。

whether 和if区别whether和if都可以引导宾语从句，表示“是否”，在口语或间接引语中两者可以互换使用。

如：I wonder if / whether I can get some advice from you.Ask him whether / if he can come.但在有些情况下，whether和if的用法有一定区别。

1. whether引导的从句常可以与连词or或or not直接连用，而if一般不能。

如：正：Let me know whether you can come or not.误：Let me know if you can come or not.2. 当宾语从句提到句首时，只能用whether引导，而不能用if。

如：正：Whether it is true or not, I can’t tell.误：If it is true or not, I can’t tell.3. whether可以引导带to的不定式，if则不能。

如：正：I don’t know whether to accept or refuse.误：I don’t know if to accept or refuse.4. whether及其引导的成分可放于介词之后，作介词的宾语，但if不能。

如：正：I worry about whether I hurt her feelings.误：I worry about if I hurt her feelings.5. whether可以引导从句，作主语、表语或同位语，而if不能。

如：正：It was uncertain whether he would come.误：It was uncertain if he would come.正：His first question was whether Tom had arrived yet.误：His first question was if Tom had arrived yet.正：We must consider the question whether we will take these measures.误：We must consider the question if we will take these measures.强化练习：1. The question has not been answered ____ Taiwan will be included on the Olympic torch relay route.A．that B．whether C．which D．if2. You have not yet answered my question _____ I can join in the party toni ght or not.A. whetherB. ifC. thatD. which 3．—I d like to invite you to a party this evening.—Thank you, but _____ I’ll be free I m not sure at the moment.A. whileB. ifC. whenD. whether4．---What are you anxious about?---___________A. If we succeedB.That we can succeedC. Do we succeedD.Whethe r we can succeed5. Only when _____ the painting _____ decide ______the painting is worth bu ying.A. he sees, he can ,whetherB. does he see, can he, ifC. he sees, can he ,whetherD. sees he, he can,that6. _____ English is his favourite subjectA. I asked him ifB. I asked him that whetherC. I asked him thatD.I asked him which7. _____ they’ll go to the Summer Palace ____ the weather.A. If; depends onB. Whether; depends uponC. Whether; depended o nD. If; depended upon8.It isn’t quite _____ ______ he will be prese nt at the meeting.A. sure; whetherB. sure; ifC. certain; whetherD. certain; that9. _____ the 2008 Olympic will be held in Beijing is not known yet.A. WhetherB. IfC. WheneverD. That10. No one was sure _____ he would be asked to speak next year.A. whenB. whetherC. whatD. how11. It is still a question to us all _____ there is any living thing in some oth er places in the space.A. whetherB. whichC. whatD. where12. I doubt _____ he will come here on time.A. thatB. whetherC. whenD. where13. The point is not who said the words, _____ they are true or not.A. but whetherB. and whetherC. but howD. and how14. “What did he ask you?” “_____ I would be late.”A. ThatB. WhenC. WhereD. Whether15. He treated all the people around him,______he knew or he didn't know,______.A. if, friendlyB. whether, friendlyC. if, in a friendly wayD. whether, in a friendly way16. At the meeting, we discussed _____ we should employ more workers.A. ifB. whetherC. thatD.不填Answers: BADDC ABCAB ABADD B。