whether和if__使用方法分析_附习题.doc

PAGE1 / NUMPAGES2 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 ） Its doubtful whether therell 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 dont 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。③Well 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 Ill 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。 Ill 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：Well 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, were 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 well build another lecture building hasnt been settled. 是否要另建一幢教学楼的