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1、1.主语从句主语从句 除了连接词除了连接词that外，还有外，还有whether,what,which,who,whom,whose,when,where,why,how,whatever,whoever 等。等。eg:Whether he will go there is not known.What he said is not true.Who broke the window has not been found out.How he escaped is still a mystery.Where he did the money is to be found out.Whoever
2、 comes is welcome.注意：注意：what 引导主语从句时，主句谓语动词一般引导主语从句时，主句谓语动词一般用单数，但如果表语是复数名词，主句谓语动词用用单数，但如果表语是复数名词，主句谓语动词用单复数单复数.eg:What we need is more time.What I have now is/are two books.2.宾语从句宾语从句 除了除了that 外，还可用外，还可用 whether,if,who,whom,whose,what,which,when,where,how,why 等引导。等引导。eg:He asked whose handwriting w
3、as the best.Im not interested in what hes saying.This depends on whether he is interested(or not).He asked if/whether you have received his letter.She asked me why he had chosen that one?if /whether (1)引导主语从句，表语从句，同位语从句只用引导主语从句，表语从句，同位语从句只用whether.eg:The question is whether it is worth doing.(2)做介词的
4、宾语时做介词的宾语时 eg:Im worried about whether he can arrive in time.(3)引导宾语从句紧跟引导宾语从句紧跟 or not时，时，eg:Please tell me whether or not you agree.(4)与不定式连用时与不定式连用时 eg:I dont know whether to accept or refuse.(5)discuss后引出宾从后引出宾从,或宾从是否定句时或宾从是否定句时(6)eg:Lets discuss whether we shall go by plane.(7)I dont care wheth
5、er he doesnt come.(6)在条件从句中，用在条件从句中，用if 而不用而不用 whether eg:If you dont agree to do it,I will ask another.注意：注意：（1）某些动词如）某些动词如 insist,suggest,ask,demand,order,advise等，其后宾语从句用虚拟语等，其后宾语从句用虚拟语气，即气，即 should+动原动原.eg:We all insist that we mot rest until we finish the work.It was demanded that we should set
6、off before daybreak.(2)否定前移。否定前移。eg:I dont believe she can marry the young lawyer.3.表语从句表语从句 在句中作表语，一般在连系动词后，在句中作表语，一般在连系动词后，引导词有引导词有:that,whether,as if,as though,who,whom,whose,what,which,when,where,how,why等等 eg:The important thing is what a man does,not what he says.The trouble is who can solve th
7、e problem.Thats what we should do.4.同位语从句同位语从句 常用常用that,whether,how,when,where,why等。等。eg:I have no idea how he did it.注意：除注意：除 that外，外，其余连词在从句中都具有各自其余连词在从句中都具有各自的意义和成分。的意义和成分。eg:He must answer the question whether he agrees to it or not.状语状语 You have no idea how worried I was.状语状语1.After Yang Liwei
8、succeeded in circling the earth,_ our astronauts desire to do is walking in space.2.A.where B.what C.that D.how3.2.A modern city has been set up in _ was a wasteland ten years ago.4.A.what B.which C.that D.where5.3.He raised a question_ the work was worth doing.6.A.if B.that C.whether D.which4.We ca
9、nnot figure out_ quite a number of insects,birds,and animals are dying out.A.that B.as C.why D.when5.These flowers are so special I would do _ I can to save them.A.whatever B.that C.which D.whichever6.Along with the letter was his promise_ he would visit me this coming Christmas.A.which B.that C.what D.whether