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名词性从句包括:主语从句、表语从句、宾语从句和同位语从句。引导名词性从句的连词有:A.连词:that, whether, if(这三个词都不作从句的成分,同时,that无含义,而whether和if都表“是否”)B.疑问代词:who, whom, whose, what, whichC.疑问副词:when, where, why, how
(一)主语从句:在复合句中充当主语的从句。
1.that引导主语从句that引导主语从句时不同于其他的连词,既无词义也不作成分,只起单纯的连接作用,且通常不可以省。为了强调that引导的主语从句而置之于句首时,that不可省。①That the driver could not control his car was obvious.②That she was chosen made us very happy.③That he will come is certain.④That he would take the risk is true.⑤That he should have married her isn't surprising.
★通常,that引导主语从句时用it做形式主语,把从句置于句尾,此时that有时可省。例如:①It was obvious that the driver could not control his car.②It made us very happy that she was chosen.③It is certain that he will come.④It is true that he would take the risk.⑤It isn't surprising (that) he should have married her.
★如果以that从句为主语的句子是疑问句,就只能用先行词it结构。例如:①Is it certain that he will come?②Is it true that he would take the risk?
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