whether和if使用方法分析附習題

1、1.whether 和 if 均可用來引導主語從句，但 if 引導的從句不能位于句首。如： Whether they win or lose is all the same to me. It's doubtful whether there'll be any seats left.他們是贏是輸於我都一樣 （. 此時 whether 不能換作 if ） 說不上還有沒有空座位了 . （此句 whether 能換作 if）2.whether 和 if 均可用來引導賓語從句我不知道我是否能來如如： I don't know whether/if I will be able

2、 to come. She asked me whether/if I was interested in working for her.她問我是否有興趣為她工作。 We'll be told tomorrow whether we should take the exam or not.我們明天才知道是不是應該參加考試 I asked him whether he had done all the work himself or whether he had had any assistance. 我問他這些工作 都是他自己做的還是別人幫他做的 .（ 注意 : 在兩個供選擇的從句之

3、間若用 or 字, 則須重復 whether 一字 . ）注: 當強調賓語從句并將其提前時只能用 whether。如 :Whether I'll have time to go with you I am not sure. 我很難說我們是否有時間跟你們一起去。 從句作介詞賓語時只用 whether 不用 if。如:She was undecided about whether she should accept his offer她拿不定主意應該不應該接受他的好意 當whether和or not連用時，只用 whether不用if。當or not放在whether引導的從句句尾，則可

4、以 用 if 來替換。如口 ： I don' t know whether or not he will come我不知道他是不是回來。I'll be happy whether/if I get the job or not 我能不能得到那份工作都一樣高興 當whether和or連用表示明確的選擇時，只用 whether不用if。如:He asked me whether I wanted to go there by train or by bus.他問我是想乘火車還是坐公共汽車去那里。He hesitated about whether he should drive o

5、r take the train.他開車去還是坐火車去 ，猶豫不決注:whether和or連用還可以引導讓步狀語從句，此時也不用if如： We'll go on with the work， whether we can find the necessary tools or not. 不管我們能否找到所需的工具，我們要把這件工作做下去。Whether or not it rains / Whether it rains or not， we're playing football on Saturday. 無論下不下雨 ， 我們星期六一定踢足球 . 動詞discuss， de

6、cide,consider等后習慣上也常用 Whether引導從句，不用if。 They discussed whether they should leave at once.他 們討論了是否應該馬上離開。 We discussed whether the house should be sold. 我們討論了這房子是否應賣掉。3. 表語從句用 whether 引導不用 if.如:The doubt was whether you had broken the beautiful vase.疑問是你是否打壞了這只漂亮的花瓶4. 同位語從句用 whether 引導不用 if.如口: The q

7、uestion whether we'll build another lecture building hasn't been settled.是否要另建一幢教學樓的問題還未決定。問題是去慕尼黑還是去維也納是否現在結婚或是等待她不知道。我們弄不清是今天走還是明天走5.在動詞不定式之前，只能用whether，不能用if。如口: The question is whether to go to Munich or Vienna. She doesn't knows whether to get married now or wait. We were wondering

8、whether to go today or tomorrow.我拿不準主意是辭職還是留任 rm not sure whether to resign or stay on.強化練習：1. The question has not been answered Taiwan will be included on the Olympic torch relay route.AthatBwhetherCwhichDif2. You have not yet answered my question I can join in the party tonight or not.A. whetherB

9、. if3 I d like to invite you to a party Thank you, but I'lble free IA. whileB. ifC.4 -Wh at are you anxious about?C. thatD. whichthis evening.m not sure at the moment.when D. whetherA.If we succeed B.That wecan succeedC. Do we succeedD.Whether we can succeed5.Only whenthe paintingdecidethe paint

10、ing isworthbuying.A.he sees, he can ,whether B.does he see, can he, ifC.he sees, can he ,whether D.sees he, he can,that6.English is his favouritesubject7.A. I asked him ifB.I asked him that whether C. I asked him thatD. Iasked him whichthey 'lgl o totheSummer Palacethe weather.A. If; depends onB

11、.Whether;depends upon C. Whether; dependedonD. If; depended upon8.It isn 'qtuitehe willbe present at the meeting.A. sure; whether B. sure; ifC. certain; whether D. certain; that9. the 2008 Olympic will be held in Beijing is not known yet.A. Whether B. If C. Whenever D. That10. No one was sure he

12、 would be asked to speak next year.A. when B. whetherC. what D. how11. 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. where12. I doubt he will come here on time.A. that B. whetherC. when D. where13. The point is not who said the words, they are true or not.A. but whether B. and whether C. but how D. and how14. “Whatdid he ask yo u? ”“ I would be late. ”A. That B. WhenC. Where D. Whether15. He treated all the people around him,he knew or he didn't know,A. if,