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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, which c.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. | 
