whether和if使用方法分析附习题

1、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. It's doubtful whether there'll be any seats left.他们是赢是输於我都一样 （. 此时 whether 不能换作 if ） 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我不知道我是否能来如如： 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.她问我是否有兴趣为她工作。 We'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 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

3、间若用 or 字, 则须重复 whether 一字 . ）注: 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。 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 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

4、以 用 if 来替换。如口 ： 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 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 o

5、r 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 . 动词discuss， de

6、cide,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:The 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.如口: The q

7、uestion 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。问题是去慕尼黑还是去维也纳是否现在结婚或是等待她不知道。我们弄不清是今天走还是明天走5.在动词不定式之前，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.我拿不准主意是辞职还是留任 rm not sure whether to resign or stay on.强化练习：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,