巧记whether与if异同讲课稿

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If 和whether的区别 (含 讲解+习题+答案)教学文稿

If 和whether的区别 (含  讲解+习题+答案)教学文稿

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的区别教学文案

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。

Unit5Whether和If之间的区别课件人教版英语八年级下册

Unit5Whether和If之间的区别课件人教版英语八年级下册

B
13. The point is not who said the words, __A___ they are true or not. A. but whether B. and whether C. but how D. and how
14. “What did he ask you?” “_D_ I would be late.” A. That B. When C. Where D. Whether 15. He treated all the people around him, _D____he knew or he didn't know,______. A. if, friendly B. whether, friendly C. if, in a friendly way D. whether, in a friendly way
10. No one was sure __B___ he would be asked to speak next year. A. when B. whether C. what D. how
11. It is still a question to us all _A there is any living thing in some other places in the space. A. whether B. which C. what D. where
In the following, you can just use “if ”.
When the object clause of the negative sentence, it usually uses “if”.
1. The question has not been answered _B Taiwan will be included on the Olympic torch relay route. A.that B.whether C.which D.if

巧记whether与if异同

巧记whether与if异同

巧记whether与if异同主从表从同位从,if不用whether用;discuss和介词后,whether引宾从;不定式、or not后在跟,whether独能显神通;宾从若是否定句,if发挥其功用;避免歧义要慎重,其他情况可换用。

一、引导主语从句,常用whether.(1)Whether the meeting will be held is uncertain.会议是否召开还不能确定.(2)It is unknown whether he will come.他是否来还不知道。

3.Whether we’ll go camping depends on the weather.二、引导表语从句常用whether(1).The question is whether he can finish the work by the end of this week.问题是到这周末他是否能完成这个工作。

(2).What we want to know is whether he will come to speak to us.我们想知道的是他能否来给我们讲话。

3.The question is whether it is worth doing.三、引导同位语从句,常用whether.(1).The question whether he will come is important.他是否来这个问题很重要。

(2).The plan whether we’ll go outing tomorrow hasn’t been made.明天我们是否郊游这个计划还没订。

(3).The question whether we need it has not been decided.四、引导宾语从句。

引导及物动词的宾语从句,用whether, if皆可;介词的宾语从句,一般只用whether引导;在whether…or not结构中,口语用if也可以,但whether or not,不可换用if;宾语从句放句首只能用whether引导。

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。

whether和if句型用法总结归纳

whether和if句型用法总结归纳

whether和if句型用法总结归纳Whether和if是两个常用的连词,用来引导条件状语从句。

虽然它们都可以引导条件句,但它们在使用上有一些不同之处。

下面是对whether和if的用法进行总结归纳。

一、用法比较1. 是否涵义Whether的主要涵义是“是否”,用来表示两种选择或两种可能性。

它引导的从句可以是陈述句或疑问句。

e.g. Please let me know whether you can come or not. 请告知我你能否来。

If的主要涵义是“假如”,用来表示一种假设或条件。

它引导的从句通常是虚拟语气句。

e.g. If it rains tomorrow, we will stay at home. 假如明天下雨,我们就呆在家里。

2. 句型结构Whether引导的从句可以是陈述句、疑问句或动词不定式结构(不定式的介词宾语)。

第1页/共5页e.g. She asked me whether I had finished the report. 她问我是否已经写完报告。

My boss is deciding whether to promote me. 我的老板在打算是否要提升我。

If引导的从句通常是陈述句、疑问句或虚拟语气句。

e.g. I don't know if he will come or not. 我不知道他会不会来。

If you need any help, just let me know. 假如你需要任何挂念,告知我。

If I were you, I would quit my job. 假如我是你,我就辞职。

3. 语气和真实性Whether引导的从句一般表示对信息的确认或否定,语气较为客观。

其后的句子常带有一些客观性的动词,如know, determine, decide等。

e.g. We need to know whether the meeting will be held as scheduled. 我们需要知道会议是否按方案进行。

whether和if的区别

whether和if的区别

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。

(完整word版)巧记whether与if异同

(完整word版)巧记whether与if异同

巧记whether与if异同主从表从同位从,if不用whether用;discuss和介词后,whether引宾从;不定式、or not后在跟,whether独能显神通;宾从若是否定句,if发挥其功用;避免歧义要慎重,其他情况可换用。

一、引导主语从句,常用whether.(1)Whether the meeting will be held is uncertain.会议是否召开还不能确定.(2)It is unknown whether he will come.他是否来还不知道。

3.Whether we’ll go camping depends on the weather.二、引导表语从句常用whether(1).The question is whether he can finish the work by the end of this week.问题是到这周末他是否能完成这个工作。

(2).What we want to know is whether he will come to speak to us.我们想知道的是他能否来给我们讲话。

3.The question is whether it is worth doing.三、引导同位语从句,常用whether.(1).The question whether he will come is important.他是否来这个问题很重要。

(2).The plan whether we’ll go outing tomorrow hasn’t been made.明天我们是否郊游这个计划还没订。

(3).The question whether we need it has not been decided.四、引导宾语从句。

引导及物动词的宾语从句,用whether, if皆可;介词的宾语从句,一般只用whether引导;在whether…or not结构中,口语用if也可以,但whether or not,不可换用if;宾语从句放句首只能用whether引导。

wether与if区别)教学提纲

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。

宾语从句whether与if的用法课件

宾语从句whether与if的用法课件
单击添加副标题
宾语从句中 引导词 whether和if 的用法
单击此处添加文本具体内容,简明扼要地阐述你的观点
宾语从句的定义
置于动词、介词等词性后面起宾语作用的 从句叫宾语从句。
01 引导词whether与if
02 当宾语从句是一般疑问句时,由连词whether或if引导,
引导词whether/if 的意义为“是否”,在从句中不作成 分,不能省略。 e.g. Lily wanted to know if/ whether her grandma liked the handbag.
Summary
介词后的宾语从句用 whether
不定式前用whether
whether引导的宾语从句可 以与or not连用
whether引导的宾语从句可 以放句首
Homework
Do the exercises in Workbook Period 3
20XX
Thank you for listening!
4
不定式前用whether
I just wonder whether to stay for another hour.
whether引导的宾语从句可以放句首
Whether they will join in the picnic I ds
1. I wondwehre_t_h_e_r_/i_f___ we'll finish the task on time. 2. I want to knowwhet_h_e_r_____ it's good news or not. 3. We are talking abwohuetth_e_r______ we admit students into our club.

辩同析异

辩同析异

辩同析异:if与whether用法贵州省余庆县城关中学郑代国If和whether都是连词,两者都有“是否,是不是”之意,但if还有“如果,假如”之意,在用法上,两者有一定的区别。

一、if和whether均可引导宾语从句,其意为“是否,是不是”,常用在know, ask, wonder 等及物动词之后。

如:I don’t know if / whether he should tell you. 我不知道他是不是应该告诉你。

注意:if和whether引导的宾语从句,可根据还需要用任何时态。

如:I asked if /whether he would go with me. 我问他是不是要我一起去。

二、if引导条件状语从句,其意为“如果,假如”,而whether没有“如果,假如”之意,不能引导条件状语从句。

如:If you study hard, you will pass the exam. 如果你努力学习,你就会通过考试注意:在if引导的条件状语从句中,主句用一般将来时,从句只能用一般现在时。

如:I will go swimming if it doesn’t rain tomorrow. 如果明天不下雨,我就要去游泳。

三、在下列情况下只能用whether,不能用if。

1.与or not连用时,只能用whether,不能用if。

如:I want to know whether you like this pen or not. 我想知道你是否喜欢这支钢笔。

2.引导的从句作介词宾语时,只能用whether,不能用if。

如:I worry about whether I hurt her feeling. 我担心是否伤了她的感情。

3.宾语从句置于句首时,只能用whether,不能用if。

如:Whether she will go to the park, I don’t know. 她是否去公园,我不清楚。

高考英语之whether和if的词语辨析和用法

高考英语之whether和if的词语辨析和用法

高考英语之whether和if的词语辨析和用法
"Whether"和"if"都可以用作从句中的连词,表示条件、选择或不确定性。

在很多情况下,它们可以互换使用,但有时候也会有一些细微的区别。

我们来看一下"whether"的用法和辨析。

"Whether"通常用于引导一个名词性从句,例如主语从句、宾语从句或表语从句。

它用来引出两种可能性中的一种,表示不同的选择或情况。

比如:
1. I don't know whether he will come to the party.(我不知道他是否会来参加聚会。


在这些例句中,"whether"引导了一个名词性从句,表达了选择或不确定性的含义。

需要注意的是,"whether"后面往往不需要再加上另一个条件从句。

接下来,让我们来看一下"if"的用法和辨析。

"If"通常用于引导条件状语从句,表达假设、条件或可能性。

比如:
"whether"和"if"都可以用作连词引导从句,但用法上有一些细微的差别。

"Whether"通常用于名词性从句,表示选择或不确定性;而"if"通常用于条件状语从句,表示假设或可能性。

在实际运用中,需要根据句子的具体语境来选择使用哪个连词,以确保表达准确和自然。

if 和whether 的区别 (课堂PPT)

if 和whether 的区别 (课堂PPT)
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。 Whether he agrees or not, I shall do that. 不管他同意与否,我都要那样做。
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三、用在动词不定式之ຫໍສະໝຸດ 时用whether。I don’t know whether to go there at once. 我不知道是不是该立刻去那里。
I didn’t know whether to laugh or to cry. 我真是哭笑不得。
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。
2. 如果or not放在whether所引导的从句句尾,则可以用 if来替换。 I don’t know whether/if he will come or not. 我不知道他是不是回来。 注意:or not放在whether之后时,只能用whether不用if。 I don’t know whether or not he will come. 我不知道他是不是回来。
注:whether引导主语从句放在主句之后时可
用if来代替。
It is unclear whether/if he likes the present.他是不是喜欢那个礼物还不清楚。
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二.在强调任意选择时,用whether…or。 He asked me whether I wanted to go there by

ifwhether的区别

ifwhether的区别

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的区别口诀

whether和if的区别口诀

whether和if的区别口诀在引导主语从句时,一般用whether,而不用if。

在引导宾语从句时,一般情况下whether和if可以通用。

从句中含有or,强调选择,这里只宜用whether;宾语从句中包括一个if从句,则宜用whether)等。

这时两者的含义区别很小,一般可通用。

I don't know whether/if they will come to help us.但是,当whether与or not连成一个词组时,whether不可换用if。

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

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。

此外,还有三种情况值得注意:1在介词后面只能用whether,不能用if。

I am not interested in whether you'll come or not.2在动词不定式之前,只能用whether,不能用if。

He doesn't know whether to stay or not.3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.只能用whether,不能用if。

It is unknown whether he will come.Whether the news is true remains a question.只能用whether,不能用if。

The question is whether they can take our advice.常用whether。

英语微课-宾语从句whether与if教案

英语微课-宾语从句whether与if教案

宾语从句whether与if的选择邱燕芳教学目标:知识目标:通过微课使学生掌握宾语从句中whether与if的区别,从而进行选择。

能力目标:提高学生宾语从句运用能力。

德育目标:通过学习使学生树立自信心,敢于挑战英语难题。

重点和难点:1、牢记单词意思2、区分whether与if,做出正确选择课型:新授课课时:6分钟教法:讲解练习相结合教具:课件教学过程Step one: Lead in翻译句子。

e.g. 1. Ask him whether (if) he can come.(他是否能来)2. I don't know whether (if) it rains.(是否要下雨)3. I don’t know whether it is going to rain or not.(是否要下雨)由此概括出,whether与if表示“是否”时,大部分情况可以互换,但有些只能whether而不能用if。

Step two: New Lesson只能用whether不能用if 的情况1.与or not 连用只能用whetherI don’t know _____ he will come or not.2. 介词后只能用whetherI don’t care of ______ he is handsome.3. 与不定式to do连用只能用whetherHe wondered ______ to stay here the next week.4. 在及物动词discuss 后的宾语从句只能用whetherWe discussed____ we should make a change in our plan.Step three: Exercise请用if、whether填空1. I asked her if/whether she had a bike.2. We’re worried about whether he is safe.3. I wonder if/whether he is well.4. I don’t know whether or not he is well.5. I don’t know whether to go.Step four: Sum up回顾只能用whether不能用if 的四种情况。

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巧记w h e t h e r与i f
异同
巧记whether与if异同
主从表从同位从,if不用whether用;
discuss和介词后,whether引宾从;
不定式、or not后在跟,whether独能显神通;
宾从若是否定句,if发挥其功用;
避免歧义要慎重,其他情况可换用。

一、引导主语从句,常用whether.
(1)Whether the meeting will be held is uncertain.会议是否召开还不能确定.
(2)It is unknown whether he will come.他是否来还不知道。

3.Whether we’ll go camping depends on the weather.
二、引导表语从句常用whether
(1).The question is whether he can finish the work by the end of this week.
问题是到这周末他是否能完成这个工作。

(2).What we want to know is whether he will come to speak to us.
我们想知道的是他能否来给我们讲话。

3.The question is whether it is worth doing.
三、引导同位语从句,常用whether.
(1).The question whether he will come is important.他是否来这个问题很重要。

(2).The plan whether we’ll go outing tomorrow hasn’t been made.明天我们是否郊游这个计划还没订。

(3).The question whether we need it has not been decided.
四、引导宾语从句。

引导及物动词的宾语从句,用whether, if皆可;
介词的宾语从句,一般只用whether引导;
在whether…or not结构中,口语用if也可以,但whether or not,不可换用if;宾语从句放句首只能用whether引导。

whether 和if常与or not 连用,但whether 和or not既可以合起来使用,也可以分开使用。

if和or not只能分开使用。

宾语从句放句首只能用whether引导。

(1).He asked whether/if they would come or not.
(2).I want to know whether/if he lives there.我想知道他是否住在那儿。

(3).I worry about whether I hurt her feeling.我担心是否伤了她的感情。

(4).I asked him whether/if he would come or not,或
I asked whether or not he would come.我问他来还是不来。

(5).Whether it is true,I can’t say.这件事是否真实,我不能说。

五、与不定式构成起名词作用的短语,用作主语,表语,宾语时,只用whether,不用if.
例如:I don’t know whether to see her.我不知道是不是去看她。

六、当if引导从句,有可能与条件状语相混而产生此义时,要用whether.例如:
Let me know if you can come.释义有:第一,把know看作不及物动词,由if
引导条件状语从句,意为“如果你能来,请通知我”;第二,把know当作及物动词,由if引导宾语从句,意为“告诉我你是否能来”。

所以,要表达后者意义,必须把if换为whether。

I’ll tell you whether he is busy. (如果将句中的whether改成if,则又歧义,因为if 还有“如果”之意)
学以致用:
选择if或whether或两者皆可,完成下面的句子.
1.I have no idea we shall have a meeting.
2.He hasn’t asked me I have time to go with you.
3. he has gone to Shanghai is not known yet.
4.I am not interested in you’ll come.
5.I don’t care the train arrives on time or not.
6.Ask him ______ he can come.
7.I wonder ______ it is right answer.
8.She doesn’t know _______ to go the cinema or watch TV.
9.I want to know _______ or not he is well.
10.________ the Olympic Games will be held in Beijing in 2008 has been decided yet.
11.------When will the sports meet be held ?
------- It depends on _______ it rains the day after tomorrow.
12.We haven’t settled the question of _________ it is necessary for him to study abroad.(06江苏)
A. if
B. where
C. whether
D. that
答案:1. whether 2. whether/if 3. Whether 4.whether 5. whether/ if
6.wheter/ if
7.whether/ if
8.whether
9.whether 10.whether 11.wheter. 12.C.
Friday, August 05, 2011。

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