However和的Whether用法

However

不管however以何种形式出现，它都不外乎以下两种用法。

一．词义剖析

1.表示让步：意为“无论如何”“不管怎样”，用来修饰形容词或副词，其词序为：however+形容词/副词+主语+谓语，相当于“no matter how”+形容词/副词+主语+谓语。这样用的however其实具有连词的功能，用以引导让步状语从句。如：however much he eats, he never gets fat. 不管他吃多少，他永远吃不胖。

用于此用法时，请注意以下几点：①此用法属however所有用法中最重要的考点②这样用的however 与no matter how 大致同义。如：People always want more, however [no matter how] rich they are. 人总是富了还想再富。however [No matter how] hard I worked, she was never satisfied. 无论我多么努力地工作，她从来没满意过。③有时从句谓语可用情态动词。如：Don’t laugh, however funny it may be. 无论多么有趣也不要笑。I’ll try to finish it in time, however hard it may be. 无论多么难，我也要按时完成。④“however＋形容词或副词＋主语＋谓语”有时可以有所省略。如：I refuse, however favorable the conditions. 不管条件如何有利，我都不干。(conditions后省去了are)I’d rather have a room of my own, however small (it is), than share a room. 无论房间多么小，我宁愿一个人住一间，而不愿意与别人合住一个房间。 A grammar rule, however true (it is), is useless unless it can be understood. 一条语法规则，不管如何正确，除非能懂，否则毫无用处。

2.表示转折：尤其用于谈及一个既成事实时，表示转折，其意为“可是”“仍然”等。可放在句首、句中或句末，通常用逗号与句子其他成分隔开。如：My father,

however, did not agree. 但是，我父亲不同意。My room is small; however, it’s comfortable. 我的房间很小，但却很舒服。He said that it was so; he was mistaken, however. 他说情况如此，可是他错了。

3.表示惊奇或强调：相当于how ever的用法，其意为“究竟怎样，到底以什么方式”。如：however did you get here without a car? 没有汽车你究竟是怎样来的呢?

4.用作连接词，引导方式状语从句。意为“无论以何种方式”，“不管怎样”。Eg: However it may be ,I shall take your word.无论如何，我将会相信你的话。二．辨析however和but

二者都意为“可是，但是”；

but是并列名词，连接两个并列分句，上下二句在总的意义上构成了对比。

I really don't like cheese, but I will try just a little this time.我实在是不喜欢吃奶酪，但是这次我要尝一点。

(1)however不能直接连接两个分句，必须另起新句，并用逗号隔开。however不能像but(但是)那样直接连接两个句子(注意正句中的标点符号)。

如：我们都已尽了最大的努力，不过我们还是输了。

正：We all tried our best, but we lost the game.

正：We all tried our best; however, we lost the game.

正：We all tried our best. however, we lost the game.

It was raining hard. However, we went out to look for the boy. 雨下得很大，不过我们还是出去寻找那个孩子

1.however比but用的场合更正式,so however用于书面语,而but 常用于口语.类似的有：肯定式为as...as,否定式为not so...as...,用于书面语和正式文体；not as...as...,用于口语和非正式文体。对于一般学习者可以不加区分。第一个是：不是像什么一样的。做个比较第二个是：不是像什么那样的。描述一个事物物。

2.however后有"," 而but 没有

3.另外,however的意思还不只局限于"但是;然而"

whether

if和whether通用，都表示“是否”的意思。一般来说，后者比较正式，在口语中前者常用来代替后者。但两者有时具有不同的暗示。用whether时，正反两面的选择意义较强，问话人并不在意回答是肯定还是否定；而用if时，则比较强调单方面，即正面，问话人希望得到肯定的回答。另外，还要注意以下几点：一、whether和if都可以与or not连用；但写在一起时，只能用whether不能用if。当whether和or not连用时，只用whether不用if。当or not放在whether引导的从句句尾，则可以用if来替换。

如: I don’t know whether or not he will come.我不知道他是不是回来。

I'll be happy whether/if I get the job or not我能不能得到那份工作都一样高兴

二、在引导宾语从句时，应注意：

1、表示“是否”时，两词都能引导宾语从句。

I wonder if/whether you can examine him now．

I asked him whether he had done all the work himself or whether he had had any

assistance. 我问他这些工作都是他自己做的还是别人帮他做的.

( 注意: 在两个供选择的从句之间若用or字, 则须重复whether一字. )

2、宾语从句移置句首时，用whether，不用if。当强调宾语从句并将其提前时只能用whether。

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。

3、宾语从句为否定形式时，通常用if，而不用whether。

如:She was undecided about whether she should accept his offer.她拿不定主意应该不应该接受他的好意

4、动词discuss，decide,consider等后习惯上也常用Whether引导从句，不用if。 They discussed whether they should leave at once.他们讨论了是否应该马上离开。 We discussed whether the house should be sold. 我们讨论了这房子是否应卖掉 5 当whether和or 连用表示明确的选择时，只用whether不用if。

如:He asked me whether I 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。

He hesitated about whether he should drive or take the train.他开车去还是坐火车去, 犹豫不决。

注:whether 和or 连用还可以引导让步状语从句,此时也不用if。

如：We'll go on with the work, whether we can find the necessary tools or not.

不管我们能否找到所需的工具,我们要把这件工作做下去。

Whether or not it rains / Whether it rains or not, we're playing football on Saturday. 无论下不下雨, 我们星期六一定踢足球.

二．在下列情况下，只能用whether，不能用if。

1、与不定式连用时，只能用whether．

如:①The question is whether to go to Munich or Vienna. 问题是去慕尼黑还是去维也纳.

②She doesn't knows whether to get married now or wait. 是否现在结婚或是等待她不知道。

③We were wondering whether to go today or tomorrow. 我们弄不清是今天走还是明天走.

④I'm not sure whether to resign or stay on. 我拿不准主意是辞职还是留任.

2、在介词后，只能用whether。

Everything depends on whether he is ready．

3、在名词后作同位语时，只能用whether。

The question whether we'll build another lecture building hasn't been settled.

是否要另建一幢教学楼的问题还未决定。

4、whether和if均可用来引导主语从句，但if引导的从句不能位于句首。如：Whether they win or lose is all the same to me. 他们是赢是输於我都一样.（此时whether不能换作if ）It's doubtful whether there'll be any seats left. 说不上还有没有空座位了. (此句whether能换作if)

Whether he comes or not doesn't concern me．

5、引导表语从句时，只能用whether。

What Maria doesn't know is whether there will be enough snow．

if可引导条件状语从句，译作“如果”，whether可引导让步状语从句，译作“不

管、无论”。

If I were you，I would not buy．

Whether he agrees or not，I shall go there．

强化练习：

1. The question has not been answered ____ Taiwan will be included on the Ol ympic torch relay route.

A．that B．whether C．which D．if

2. You have not yet answered my question _____ I can join in the party tonight or not.

A. whether

B. if

C. that

D. 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. while

B. if

C. when

D. whether

4．---What are you anxious about?

---___________

A. If we succeed

B.That we can succeed

C. Do we succeed

D.Whether we can succeed

5. Only when _____ the painting _____ decide ______the painting is worth buyi ng.

A. he sees, he can ,whether

B. does he see, can he, if

C. he sees, can he ,whether

D. sees he, he can,that

6. _____ English is his favourite subject

A. I asked him if

B. I asked him that whether

C. I asked him that

D. I asked him which

7. _____ they’ll go to the Summer Palace ____ the weather.

A. If; depends on

B. Whether; depends upon

C. Whether; depended o

n D. If; depended upon

8.It isn’t quite _____ ______ he will be present at the meeting.

A. sure; whether

B. sure; if

C. certain; whether

D. certain; that

9. _____ the 2008 Olympic will be held in Beijing is not known yet.

A. Whether

B. If

C. Whenever

D. That

10. No one was sure _____ 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 _____ there is any living thing in some other places in the space.

A. whether

B. which

C. what

D. where

12. I doubt _____ he will come here on time.

A. that

B. whether

C. when

D. where

13. The point is not who said the words, _____ they are true or not.

A. but whether

B. and whether

C. but how

D. and how

14. “What did he ask you?”“_____ I would be late.”

A. That

B. When

C. Where

D. Whether

15. He treated all the people around him,______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

16. At the meeting, we discussed _____ we should employ more workers.

A. if

B. whether

C. that

D.不填

Answers: BADDC ABCAB ABADD B

巧记whether与if异同讲课稿

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；

九年级中考复习：whether和if区别【含答案】

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

Whether it be 句式中的语法

Whether it be bird, fish or beast... 提问者：johnleo - Q籽一级[收藏] 悬赏沪元：20浏览1206 次 Whether it be bird, fish or beast, the porpoise is intrigued with anything that is alive. 请问这里为什么要用(should) be虚拟式，它不表示与事实相反，不表示愿望、假想和建议。它到底要用虚拟式表示什么呢？谢谢 问题补充：如果要用whether it is bird, fish or beast...和原句有什么区别？ 最佳答案 海豚对凡是活的东西都感兴趣，不管是鸟、是鱼，还是野兽。 ------------------------------- 虚拟语气用在由“whether” 引导的让步状语从句中，从句谓语用原形动词。 All engines work on this principle, whether they be large or small. 所有发动机都按这一原理工作，无论它们是大还是小。 We must finish the work before we go home, whether it be early or late. 无论时间早晚，我们必须在回家前干完工作。 All matter, whether it be gas, liquid or solid, is made up of atoms. 所有物质，不论是气体，液体，或固体，都是由原子构成。

在此句型中，可省去whether ，而将be放在主语前。例如： Be it so, we must continue to do the test. We must do our best to fulfil the task, be it ever so hard. ------------------------------------------- Whether it is bird, fish or beast , ................. . 这样的句型属于宾语从句前置。 ------------------- 比如：Whether it is true or not, I can't tell. 陈述的句子是：I can't tell whether it is true or not. -------------------- 你原句的主句是：the porpoise is intrigued with anything that is alive. 因此前面需要一个状语从句，即whether引导的让步状语从句，就要用虚拟语气。

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。 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. 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。 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. 答案是C。 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. 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. 后可接不定式，而if不能。如：Please tell us whether to go or stay here. 6.在有些动词（如discuss）之后，只能用whether，而不用if引导宾语从句。如：We discussed whether we should close the shop. 7.在引导否定概念in宾语从句时，只能用if，而不用whether.如：he asked me if I hadn't finished my work. 英语时态一般现在时表示现在、经常或习惯的动作或状态和普遍现象、常识或客观真理；一般过去时用于过去某一时间内发生的或过去习惯性的动作或状态；一般将来时表示将要发生的动作或存在的状态，将来打算做的事情；现在完成时表示过去发生的动作造成目前的结果和对现在造成的影响或表示从过去延续至今的动作、状态和习惯等；将来完成时表示将来某时之前业已完成或发生的事情；过去完成时表示过去某时间之前已经发生的动作或状况，即过去的过去。注意每一种时态与其他时态的交叉使用情况。英语共有十六种时态，其表现形式如下(以study为例)： 一般时进行时完成时完成进行时 study studies am studying is studying are studying have studied has studied have been studying has been studying studied was studying were studying had studied had been studying shall study will study shall be studying will be studying shall have studied shall have been studying will have been studying should study would study should be studying would be studying should have studied would have studied should have been studying would have been studying 但考试中出现的一般有以下几种。 第一节一般现在时 一、表示一般性或经常发生的动作或状态 二、表示习惯性动作和状态或普遍的现象或常识 三、表示客观事实、客观规律和客观真理。在宾语从句中，即使主句的谓语动词用了过去时，只要从句表示的是客观真理，从句的谓语动词也要用一般现在时 四、祈使句必须用动词原形，其否定结构用“don`t＋动词原形”，如：Go and fetch some water. ／Don`t do that. 五、在反义疑问句中，如果主句用肯定句，那么，反问句用否定形式；如果主句用否定形式，那么，反问句就用肯定形式。而且前后在时态上要一致。但祈使疑问句用won`t you进行反问。如：See a film tonight, won`t you？ 注：①祈使句后边可用附加疑问句，以加强语气。如果祈使句用肯定形式，附加疑问句用否定形式；如果祈使句用否定形式，附加句用肯定形式；如：Come here next Sunday, won`t you ／Don`t tell it to anyone, will you ②但如果祈使句的前一句有了表示强烈肯定的语言环境，即使祈使句用了肯定形式，其附加成分也可以用“will you”(表示肯定，如

If和+whether的用法讲课教案

If和whether if不能替换whether的5种情况 1.正式文体中，句中有or not 时 2.引起主语，表语，同位语从句时 3.作介词宾语时 4.放不定式前，与不定式组成词组时 5.作discuss等词的宾语时 以上是if和whether表示"是否"之意的区别，此外，if还有加入的意思，引起条件状语从句；而whether 另有不管无论之意，引起让步状语从句 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.whether B.If C.Whether D.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 worthdoing. 4.在名词之后引导同位语从句时，用whether而不用if。如：The puestion whether the students answered correctly should be decided by the teacher. 5.whether后可接不定式，而if不能。如：Please tell us whether to go or stay here. 6.在有些动词（如discuss）之后，只能用whether，而不用if引导宾语从句。如：We discussed whether we should close the shop. 7.在引导否定概念in宾语从句时，只能用if，而不用whether.如：he asked me if I hadn't finished my work. 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.

however的用法

With the possible exception of the Beatles, no other band has become so successful so quickly. 可能除了披头士乐队这个例外，还没有哪个乐队如此转瞬走红的。 并列句中连接词语的功能 2006-03-01 18:54:21 ??英语中，包含两个或两个以上互不依从的主谓结构的句子称为并列句，各个相互独立的主谓结构叫作分句，多数情况下并列句中的分句由并列连接词来连接。并列句的分句之间关系密切，而并列连接词是分句之间关系的纽带，它们起着承上启下的作用，显示了分句之间逻辑关系，指示了说话人思维的走向。因此，正确理解和掌握连接词语是我们能否正确理解话语篇章意义的关键。表示并列关系的词语除了并列连词（如：and，but，or，so，for等），还有并列词组（如：in addition，as a result 等）和连接性副词（如：however，moreover，otherwise等），这里统称为连接词语。根据连接词语的语义功能，可将其分类如下： 1．表示补充、添加关系的连接词 这类连接词表示后面分句的句意是对前面分句句意的补充，说的是同类事情。常用的有：and，in addition，besides，moreover，furthermore，likewise，in the same way，what’s more 等。例如： Irene did not answer，and James，too，ceased speaking． 艾琳没有回答，詹姆斯也不再说话。（说的都是"保持沉默"） Bicycling is good exercise，moreover，it doesn’t pollute the air． 骑自行车是项很好的运动，而且又不污染空气。（说的都是骑自行车的优点） A flood will break a dam；likewise， the oppressed people everywhere will overthrow their oppressors in the end． 洪水会冲毁大坝，同样，任何地方的被压迫人民也会推翻他们的压迫者。（说的是同一道理） 2．表示转折关系的连接词 这类连接词表示后面分句在意义上与前面的分句发生了转折，说的是不同情况或不同的观点。常见的有：but，however，nevertheless，instead，on the contrary，on the otherhand，yet，by contrast，whereas等。例如： The situation looked desperate，but they didn’t give up hope． 形势看来非常危急，但他们没有放弃希望。 It’s too wet to go for a walk；let’s go swimming instead． 天气潮湿，不宜去散步，我们改去游泳吧。 There was no news；nevertheless，she went on hoping． 尽管没有消息，她仍抱着希望。 3．表示因果关系的连接词

if、 whether 用法总结

whether,if if和whether通用，都表示“是否”的意思。一般来说，后者比较正式，在口语中前者常用来代替后者。但两者有时具有不同的暗示。用whether时，正反两面的选择意义较强，问话人并不在意回答是肯定还是否定；而用if时，则比较强调单方面，即正面，问话人希望得到肯定的回答。另外，还要注意以下几点： 一、whether和if都可以与or not连用；但写在一起时，只能用whether，不能用if。如： I don't care whether (或if) it will rain or not． I don't care whether or not it will rain. (不用if) 二、在引导宾语从句时，应注意： 1、表示“是否”时，两词都能引导宾语从句。 I wonder if/whether you can examine him now． 2、宾语从句移置句首时，用whether，不用if。

Whether it is true or not，I can't say． 3、宾语从句为否定形式时，通常用if，而不用whether。 I asked Tom if Mary wouldn’t come． 4、作discuss等词的宾语，用whether不用if。 We discussed whether we should buy the gift for him． 三、在下列情况下，只能用whether，不能用if。 1、与不定式连用时，只能用whether． He can't decide whether to accept or refuse． 2、在介词后，只能用whether。 Everything depends on whether he is ready． 3、在名词后作同位语时，只能用whether。

if与whether用法区别

if与whether用法区别 收集整理：王俊尧 1.下列情况只能用whether： （1）直接与or not连用时,往往用whether(if…or not也可以使用)。如: Let me know whether or not he will come. (= Let me know whether / if he will come or not.) 让我知道他是否能来。 I don't know whether or not he does any washing. (= I don't know whether / if he does any washing or not.) 我不知道他在家洗不洗衣服。 I wonder whether we stay or whether we go. 我想知道我们是去还是留。 (2) 在介词之后用whether。如： I'm interested in whether he likes English． 我关心的是他是否喜欢英语。 We're thinking about whether we can finish the work on time． 我们正在考虑是否能按时完成这项工作。 I worry about whether I hurt her feelings． 我担心是否伤了她的感情。 (３)在不定式前用whether。如： He hasn't decided whether to visit the old man． 他尚未决定是否拜访那位老人。 I don't know whether to go．我不知去否。 He hasn't decided whether to go by bus or by train． 他还未决定是乘公共汽车去还是坐火车去。 （４）whether置于句首时，不能换用if。如： Whether this is true or not，I can't say． 这是否真的我说不上来。 （５）引导主语从句和表语从句时宜用whether。如： Whether she will come or not is still a question． 她是否能来还是个问题。 The question is whether we can catch the bus． 问题是我们能否赶上公共汽车。 （６）若用if会引起歧义时，则用whether。如：

whether和if用法

1.whether和if均可用来引导主语从句，但if引导的从句不能位于句首。 如：Whether they win or lose is all the same to me. 他们是赢是输於我都一样.（此时whether不能换作if ） It's doubtful whether there'll be any seats left.说不上还有没有空座位了.(此句whether能换作if) 2.whether和if均可用来引导宾语从句。如： ①I don't know whether/if I will be able to come.我不知道我是否能来. ②She asked me whether/if I was interested in working for her.她问我是否有兴趣为她工作。 ③We'll be told tomorrow whether we should take the exam or not.我们明天才知道是不是应该参加考试. ④I asked him whether he had done all the work himself or whether he had had any assistance. 我问他这些工作都是他自己做的还是别人帮他做的. ( 注意: 在两个供选择的从句之间若用or字, 则须重复whether一字. ) 注:⑴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。 ⑵从句作介词宾语时只用whether不用if。 如:She was undecided about whether she should accept his offer. 她拿不定主意应该不应该接受他的好意 ⑶当whether和or not连用时，只用whether不用if。当or not放在whether引导的从句句尾，则可以用if来替换。 如: I don’t know whether or not he will come.我不知道他是不是回来。 I'll be happy whether/if I get the job or not我能不能得到那份工作都一样高兴 ⑷当whether和or 连用表示明确的选择时，只用whether不用if。 如:He asked me whether I 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。 He hesitated about whether he should drive or take the train.他开车去还是坐火车去, 犹豫不决注:whether 和or 连用还可以引导让步状语从句,此时也不用if。 如：We'll go on with the work, whether we can find the necessary tools or not. 不管我们能否找到所需的工具,我们要把这件工作做下去。 Whether or not it rains / Whether it rains or not, we're playing football on Saturday. 无论下不下雨, 我们星期六一定踢足球. ⑸动词discuss，decide,consider等后习惯上也常用Whether引导从句，不用if。 They discussed whether they should leave at once.他们讨论了是否应该马上离开。We discussed whether the house should be sold. 我们讨论了这房子是否应卖掉。 3.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。 4.同位语从句用whether引导不用if. 如:①The question whether we'll build another lecture building hasn't been settled. 是否要另建一幢教学楼的问题还未决定。 5. 在动词不定式之前，只能用whether，不能用if。 如:①The question is whether to go to Munich or Vienna. 问题是去慕尼黑还是去维也纳. ②She doesn't knows whether to get married now or wait. 是否现在结婚或是等待她不知道。 ③We were wondering whether to go today or tomorrow. 我们弄不清是今天走还是明天走. ④I'm not sure whether to resign or stay on. 我拿不准主意是辞职还是留任. Answers: BADDC ABCAB ABADD B

最新下面就whether的这一用法作一归纳资料

精品文档 下面就whether的这一用法作一归纳。 一、作“是……还是……”解时，whether表示一种选择，其后可以跟介词短语或不定式短语。 1. 后跟介词短语。例如： （1）She made the mistake whether by accident or by design. 不知她是偶然还是故意去犯这个错误的。 （2）Whether through choice or obedience I don”t know, but he certainly did all the work very well. 是出于内心自愿还是奉命行事，这我不晓得，不过他的确是把所有的工作都做好了。 2. 后跟动词不定式短语。例如： （1）I don’t know whether to accept the offer or refuse it. （= It is doubtful whether to accept the offer or refuse it. ）对这个提议，我不知道是接受好，还是拒绝好。 （2）It is to be decided whether to go or stay here. 是走还是呆在这儿还有待决策。（it作形式主语。） （3）Will you advise me whether to accept his suggestion （or not）？ 向你请教，我是否要接受他的建议？ 二、作“是否，会不会”解时，whether可用来引导名词性从句，即主语从句、宾语从句、表语从句和同位语从句。 1. 引导主语从句。引导主语从句时，可用it作形式主语。例如： （1）Whether they consider this opinion or not is not clear. （= It is not clear whether they consider this opinion or not. ） 他们是否考虑这个意见还不清楚。 （2）Whether we shall be able to come is doubtful. （= It is doubtful whether we shall be able to come. ）我们是否能够来，尚不确定。 2. 引导宾语从句。这时whether可与if换用。例如： （1）A simple experiment will show whether air has weight or not. （= A simple experiment will show if air has weight. ）一个简单的实验就可以证明空气是否有重量。 （2）I wonder whether we shall be in time for the last bus or （whether we shall）have to walk home. 我不知道我们是否可以赶上最后一班公共汽车，或是只好步行回家。 3. 引导表语从句 The question is whether we have to make a decision at once or not. 问题是我们是否必须马上作出决定。 4. 引导同位语从句。它的前面通常有fact, conclusion, news, problem, question, idea, doubt等名词作同位语结构的中心词。例如： （1）She has answered the question whether or not this supermarket is the largest one in the region. 她回答了这样一个问题，即该超市在这个地区是不是最大的。 （2）The question whether we ought to call in a specialist was answered by the family doctor. 关于我们是否该请一位专家过来的问题，家庭医生已经作了回答。 三、作“不论……还是……”解时，whether引导让步状语从句。例如： （1）Whether you can see the moon or not, it is always round. 不论你能否看得见，月亮总是圆的。 （2）You may rely upon my help, whether others help you or not. 不论别人帮不帮你，你都可以依赖我的帮助。 四、whether or no除了能够像whether or not一样引导名词性从句外，还能单独放在句首或句末，作“无论如何”解。这时，它仅起状语作用。例如： 精品文档

it 做形式主语和however 用法

不管however以何种形式出现，它都不外乎以下两种用法。 1. 用作副词 (1) 表示让步：意为“无论如何”“不管怎样”，用来修饰形容词或副词， 其词序为：however+形容词或副词+主语+谓语。这样用的however其实具有连词的功能，用以引导让步状语从句。如： however much he eats, he never gets fat. 不管他吃多少，他永远吃不胖。 用于此用法时，请注意以下几点： ①此用法属however所有用法中最重要的考点，同学们务请引起高度重视。 ②这样用的 however 与 no matter how 大致同义。如： People always want more, however [no matter how] rich they are. 人总是富了还想再富。 however [No matter how] hard I worked, she was never satisfied. 无论我多么努力地工作，她从来没满意过。 ③有时从句谓语可用情态动词。如： Don’t laugh, however funny it may be. 无论多么有趣也不要笑。 I’ll try to finish it in time, however hard it may be. 无论多么难，我也要按时完成。 ④“however＋形容词或副词＋主语＋谓语”有时可以有所省略。如： I refuse, however favorable the conditions. 不管条件如何有利，我都不干。(conditions 后省去了are) I’d rather have a room of my own, however small (it is), than share a room. 无论房间多么小，我宁愿一个人住一间，而不愿意与别人合住一个房间。 A grammar rule, however true (it is), is useless unless it can be understood. 一条语法规则，不管如何正确，除非能懂，否则毫无用处。 (2) 表示转折：尤其用于谈及一个既成事实时，表示转折，其意为“可是”“仍然”等。可放在句首、句中或句末，通常用逗号与句子其他成分隔开。如： My father, however, did not agree. 但是，我父亲不同意。 My room is small; however, it’s comfortable. 我的房间很小，但却很舒服。 He said that it was so; he was mistaken, however. 他说情况如此，可是他错了。注：however不能像 but(但是)那样直接连接两个句子(注意正句中的标点符号)。如： 我们都已尽了最大的努力，不过我们还是输了。. 正：We all tried our best, but we lost the game. 正：We all tried our best; however, we lost the game. 正：We all tried our best. however, we lost the game. (3) 表示惊奇或强调：相当于how ever的用法，其意为“究竟怎样，到底以什么方式”。如：however did you get here without a car? 没有汽车你究竟是怎样来的呢? No matter +疑问词或者疑问词-ever 含义为“无论……都, 不管……都”。他们引导让步状语从句，并且可以互换。

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

but,however,while,although和though用法小结

but, however, while, although和though用法小结 【观察】阅读下列句子，注意各句中黑体单词的用法。 1. We have made some achievements, but we should be modest. 2. He promised to help me. However, he is busy and hasn’t come. 3. She felt ill. She went to work, however, and tried to concentrate. 4. He said that it was so; he was mistaken, however. 5. You like sports, while I’d rather read. 6. While I understand what you say, I can’t agree with you. 7. Although / Though it was late, she went on working. 8. Tired though he was, he went on working. 9. Although he’s got a good job now, he still complains. 10. She promised to phone. I heard nothing, though. 【归纳总结】 ★but与however均可表示转折，意为“但是，然而”，都可以引出表转折意义的句子（句1-句4），但二者用法也有区别： 1. 从语义上看，but所表示的是非常明显的对比，转折的意味较however要强。 2. 从语法上看，but是个并列连词，而however却是个连接副词（句2-句4）。 3. 从语序上看，but总是位于它所引出的分句之首，而however可位于句首、句中或句尾。