高考英语whether和if的区别ppt课件

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,whether,和,if,在名词性从句中的用法区别,whether和if在名词性从句中的用法区别,1,whether,和,if,均可用在名词性从句当中，但再用法上又有很大的区别。我们将从以下,5,点来区别二者的用法,whether和if均可用在名词性从句当中，但再用法上又有,2,1.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,eg,.,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),语法公式：,whether,主语从句,+,谓语,+.,1.whether和if均可用来引导主语从句，但if引导的从,3,2,用,whether,或,if,引导的宾语句,whether,和,if,均可引导,动词后的宾语从句，常可互换,。,如,：,I dont,know,whether/if I will be able to come.,我不知道我是否能来,.,She,asked,me whether/if I was interested in working for her.,她问我是否有兴趣为她工作。,2用whether或if引导的宾语句 whether和if,4,.,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 dont 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,语法公式：,whether+or not,whether/if+or not,.当whether和or not连用时，只用whether,5,Everything depends on,whether we have enough money,.,I dont care about,whether you have money or not.,介词,后的宾语从句一般,不用,if,引导，要用,whether,。,Everything depends on whether,6,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,Were worried about _ he is safe.,whether,语法公式：,介词,+whether,宾语从句,She was undecided about whethe,7,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,.,.,在两个供选择的宾语从句之间若用,or,则须重复使用,whether,语法公式：,whether,从句,+or+whether,从句,I asked him whether he had don,8,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,语法公式：,Whether,宾从,+,主语,+,谓语,当强调宾语从句并将其提前时只能用whether。语法公式：W,9,.,当,whether,和,or,连用表示明确的选择时，,只用,whether,不用,if,。,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,语法公式：,whetheror.,.当whether和or 连用表示明确的选择时，语法公式：,10,.,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。,语法公式：,discuss/decide/consider,+whether,宾语从句,.动词discuss，decide,consider等后习,11,At,the meeting,we discussed _ we should employ more workers.,A,.ifB.whetherC.thatD.,不填,B,At the meeting,we discussed _,12,.,doubt,用于肯定结构时，后面用,whether/if,引导名词性从句；用于否定结构或疑问结构时，后面用,that,引导名词性从句。,主,语,+doubt+whether/if,从句,I doubt,if,he can come back.,I dont doubt that,从句,I dont doubt that,he we will win,in the sports meeting,.doubt用于肯定结构时，后面用whether/if 引,13,I doubt _ he will come here on time.,A.that,B.whether,C.when,D.where,B,I doubt _ he will come her,14,be sure,用于,肯定句或疑问句,时，后,接,that,引导的名词性从句；用于,否定句时，后接,whether/if,引导,的名词性从句。,They,are sure that,he can help them,We,were not sure whether,we,could win that competition,or not,at that time,be sure 用于肯定句或疑问句时，后接 that 引导的,15,No,one was sure _ he would be asked to speak next year.,A,.whenB.whether,C.whatD.how,B,No one was sure _ he would,16,3.,表语从句用,whether,引导不用,if.,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。,语法公式：系动词,+whether,表语从句,3.表语从句用whether引导不用if.语法公式：系动词+,17,4.,同位语从句用,whether,引导不用,if,.,The,question,whether,well build another,lecture building hasnt been settled.,是否要另建一幢教学楼的问题还未决定。,语法公式：抽象名词,+whether,同位语从句,4.同位语从句用whether引导不用if.语法公式：,18,5.,在动词不定式之前，只能用,whether,，,不能用,if,。,The question is,whether to go,to Munich,or Vienna.,问题是去慕尼黑还是去维也纳,.,She doesnt knows,whether to get,married,now or wait.,是否现在结婚或是等待她不知道。,高考英语whether和if的区别ppt课件,19,We were wondering,whether to go,today,or tomorrow.,我们弄不清是今天走还是明天走,.,Im not sure,whether to resign,or stay on.,我拿不准主意是辞职还是留任,.,语法公式：,whether to do,We were wondering whether to,20,Sum up,:,whether,与,if,的辨用,表“,是否,”时，,在,在名词性从句中,下列,情况下只用,whether,。,主语从句,whether,主语从句,+,谓语,+.,表语从句,系动词,+whether,表语从句,c,.,同位语,从句,抽象名词,+whether,同位语从句,e,.,介词后的宾语,从句,介词,+whether,宾语从句,f,.,后接动词不定式,(,whether to do sth,.),g,.,whether+or not,h,.,whether/if+or not,Sum up:whether与if的辨用表“是否”时，在在,21,