If 和whether的区别 (含 讲解+习题+答案)教学文稿
(完整word版)if和whether的区别

(完整word版)if和whether的区别if和whether的区别55主语表语同位语从句都是whether的If只能在宾语和条件状语从句中寻求生存,当“如果”、“否定”时用if一、绝对用 whether 的情况1、引导主语从句It is unknown whether he will come.Whether the news is true remains a question。
2、引导表语从句The question is whether they can take our advice.3、引导同位语从句Th e question whether he’ll come is unknown.二、引导宾语从句这时两者的含义区别很小,一般可通用。
特殊情况:1、有or not存在时,要看是否紧连空格I don't know whether/if they will come to help us.whether与or not粘在一起连成一个词组时用whetherI don’t know whether or not they will come for our help.whether和or not一旦不粘在一起,在口语中可以用if,也可以用whether。
I 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。
2、空格前有介词出现,在介词后面只能用whether,不能用if.I am not interested in whether you’ll come or not。
3、空格后有动词不定式,只能用whether,不能用if。
He doesn't know whether to stay or not。
4、在及物运动discuss后的宾语从句中,只能用whether,不能用if.We discussed whether we should make a change in our plan.5、if可以用来引导一个否定的宾语从句,whether则不能用来引导否定的宾语从句,因为它表示正反两方面的选择意义比较强.Tell me if it is not going to rain, please.三、引导条件状语从句,whether作“是否"解,用if的意思是"如果”.Please let me know whether you intend to come. “请让我们知道你是否想来。
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。
2)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。
3)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。
④We haven't settled the question of whether we'll renew our supplies of coal for factory. 是否要为我们工厂补充一些煤,这个问题我们还没有决定。
if-和whether-的区别备课讲稿

(3). 通常用 whether 的场合
一. 在引导主语从句、表语从句、同位语从句时一 般用whether。如: ⑴Whether it is true remains a question. (主语从句)那是不是真的还是个问题。 ⑵The question is whether it is true. (表语从句)问题是是不是真的。 ⑶We have a doubt whether it is true. (同位语从句) 我们怀疑那是不是真的。
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四.虽引导宾语从句,但为了强调宾语部分,也可 把从句放在句首,此时只用whether。
Whether he will come I am not sure. 他是不是来我拿不准。 Whether he is single I don’t know. 他是否单身,我不知道。
五. 从句作介词宾语时只用whether。
train or by bus. 他问我是想乘火车还是坐公共汽车去那里。
I don’t know whether he is wrong or she is wrong. 我不知道是他错了,还是她错了。
注:whether和or一起还有“不管”之意,引导让步 状语从句。
Whether he drives or takes the train, he will be here on time. 不管开车来还是乘火车来,他都会准时到。
if-和whether-的区别
(2). 通常用 if 的场合
当引导一个否定的宾语从句时,通常用 if 而不用 whether。如: I don’t care if it doesn’t rain. 我不在乎天是否下雨。
if和whether的区别教学文案

i f 和wh e t h e r 的区别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 kn ows 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弓I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 woma n 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。
whether-if-区别加习题

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。
whether和if的区别 有哪些不同

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。
if 和 whether 的用法区别习题(答案及解析)

If 和 whether 的区别可大可小,大的是 if 可以引导条件句和 whether 与 or not 的连用的区别,小的是它们引导宾语从句的差别,因此为了安全起见,这里有一个简单的规则,if 用于引导条件句,当有明确的有两种选择或可能,或表示无论是否时用 whether,而且在正式写作中,引导宾语从句的最好用 whehter。
一、用 if 或 whether 完成下列的句子1、_____ you like it or not, you have to take this rest.2、_____ I were you, I would apply for this job.3、_____ you have any questions, please do not hesitate to ask me.4、You have to decide _____ he is going to be promoted or not.5、_____ to run or hide is a dilemma I face on a daily basis.6、I didn’t know _____ he would arrive on Friday or Saturday.7、_____ we save enough money this year, next year we can travel more.8、_____ he plays is irrelevant.9、Can you please tell me _____ or not you're going to accept this job.10、We need a decision on _____ the second answer is also correct.11、_____ you failed this test, try gain.12、The game will be abandoned _____ it snows.13、I need to talk about _____ the kids are old enough to travel on their own.14、The day will happen _____ or not you get up.15、I don’t know _____ to buy the blue one or the red one.二、答案及解析1、whether解析:当用于提出两种方案(you like it 和 you don't like it)时用 whether,或者该句不是条件句,所以只用 whether。
wether与if区别)教学提纲

w e t h e r与i f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:① whether 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.② whether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.④ whether 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.⑤ whether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 decided 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 essenti al.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。
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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。