名词性从句用法讲解与专项练习题及答案名词性从句包括主语从句、宾语从句、表语从句和同位语从句。
高考常从连接词的选择、语序、语气、时态等方面来考查。
名词性从句中的连接词有连词that / whether / as if，连接代词what / who/ which /whose / whatever / whoever / whomever / whichever，连接副词where /when /why / how / wherever / whenever。
第1讲引导名词性从句的连接词考点1.引导名词性从句的连接词有哪些有学生认为，引导同位语从句只能用that, 这句话对吗？先看下面几个句子。
①I have no question that he will come.②I have a question whether he will come③I have a question when he will come.我们可以看出：上面三个句子中question后面都是同位语从句，都是说明question的内容的。
在句①中，同位语从句的原句是陈述句，由that引导；在句②中，原句是一般疑问句，由whether引导；在句③中，同位语从句的原句是特殊疑问句，特殊疑问词也起着连接作用。
其实，所有名词性从句的连接词都有上面的三种情况。
宾语从句：I don’t know that he will come.I don’t know whether/if he will come.I don’t know when he will come.表语从句：What I don’t know is that he will come.What I don’t know is whether he will come.What I don’t know is when he will come.主语从句That he will come is obvious.Whether he will come isn’t known yet.When he will come isn’t known yet.1.【2010浙江】It is uncertain ______ side effect the medicinewill bring about, although about two thousand patients have taken it.A. thatB. whatC. howD. whether2.【2012全国新课标】It is by no means clear ______ thepresident can do to end the strike.A. howB. whichC. thatD. what3.【2012山东】It doesn’t matter ______ you pay by cash orcredit card in this store.A. howB. whetherC. whatD. why 4.【2013陕西】It remains to be seen ______ the newlyformed committee’s policy can be put into practice.A. thatB. whichC. whatD. whether5.【2009天津】It is obvious to the students ______ theyshould get well prepared for their future.A. asB. whichC. whetherD. that6.【2012江西】It suddenly occurred to him ______ he had lefthis keys in the office.A. whetherB. whereC. whichD. that考点2.引导词that的省略问题主语从句、表语从句、同位语从句中连词that不能省略。
That they are good at English is known to us all.The problem is that we don’t have enough money.She expressed her hope that they would come to China one day.只有宾语从句中的连接词that可省略，但在以下几种情况中that也不能省略：A.当that从句和主句谓语动词之间有插入词语或者从句主语之间有插入语时，that不可省略。
He judged that, because he was a child, he did not understand.B.当两个名词性从句并列作宾语时，后面的that不能省。
Everyone knew what happened and that she was worried.C.当that作介词宾语时，that不可省掉。
The reason lies in that she works harder than the others do.7.______ we need more practice is quite clear.A. WhenB. WhatC. ThatD. /8.______ fashion differs from country to country may reflectthe cultural differences from one aspect.A. WhatB. ThatC. ThisD. Which9.【2010上海】One reason for her preference for city life is______ she can have easy access to places like shops and restaurants.A. thatB. howC. whatD. why10.The reason why I didn’t go to Shanghai was ______ a newjob.A. because I gotB. because of gettingC. I gotD. that I got11.【2011全国I】The next thing he saw was smoke ______from behind the house.A. roseB. risingC. to riseD. risen12.Having checked the doors were closed, and ______ all thelights were off, the boy opened the door to his bedroom.A. whyB. thatC. whenD. where13.I know nothing about the young lady—______ she is fromBeijing.A. exceptB. except forC. except thatD. besides14.Human beings are different from animals ___ they can uselanguage as a tool to communicate.A. for thatB. in thatC. in whichD. for which(如果不理解本题，可以参看P. 错误!未定义书签。
错误!未找到引用源。
)考点3.whether 与if引导名词性从句时的区别A.在主语从句、表语从句、同位语从句中只能用whether,不能用if。
Whether the meeting will be put off has not been decided yet.The question is whether they have so much money.We ought to discuss carefully the question whether we can do it or not.B.在宾语从句中whether和if可以互换，但：i.作介词宾语时连接词一般用whether。
如：It all depends on whether they will come back.ii.后面直接跟or not 时用whether。
如：I didn’t know whether or not he had arrived in Wuhan.C.whether也可与动词不定式连用，但if不能。
I have not decided whether to go or not.D.whether常与or连用表示一种选择，if不能这样用：The question of whether they are male or female is not important.E.whether可引导一个让步状语从句表示“不管”、“无论”，而if不能。
如：Whether he comes or not, we will begin our party on time.F.discuss后通常用whether。
15.______ you can succeed in the end will mainly depend on______ you do and ______ you do it.A. If; what; whyB. Whether; what; howC. Whether; how; whyD. That; whether; how16.【2009上海】It is not immediately clear ______ thefinancial crisis will soon be over.A. sinceB. whatC. whenD. whether17.They discussed ______ they could settle the problemwithout others’ help.A. ifB. thatC. whatD. whether18.What the doctor is uncertain about is ______ my mother willrecover from the serious disease soon.A. whenB. howC. whetherD. why19.Mr. Hopkins has not yet answered my question ______ I cango with him to ______ he calls the Underground Treasure House next week.A. that; whichB. that; whereC. whether; thatD. whether; what20.I have no idea ______ or not he has finished the work.A. ifB. thatC. whetherD. which 考点4.question 与doubt 后跟同位语从句时的连接词问题doubt，question用于肯定结构时，后面用whether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。