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名词性从句 一．定义：在复合句中起名词作用的从句叫做名词性从句。 二．范围：它包括 主语从句、 宾语从句、 表语从句 和 同位语从句。 三．引导词：引导名词性从句的连接词可分为三类：连接词：that, whether, if （不充当从句的任何成分）连接代词：what, whatever, who, whoever, whom, whose, which. 连接副词：when, where, how, whythat 和what 的选用 that 和 what 都可引导所有的名词从句。但是，what除起连接作用外，还在名词性从句中充当成分，可做从句的主语、宾语、或表语。而that在名词性从句中不充当任何成分，只起连接作用。 1).What he wants is a book. 2). That he wants to go there is obvious.3).The result is that we won the game.4). I have no doubt that he will come.5). I have no idea what he did that afternoon. 6).After months of voyage ,Columbus arrived in what later proved to be a new continent. 7). On stepping into his room, he was astonished to find the floor covered with what looked like tiny insects. 2.who和whoever的选用 who引导的从句指代的是事，翻译成“谁”，是特指。 whoever引导的从句指代的是人（anyone who),意思是“无论是谁”，是泛指。 1.The book can be of help to whoever?wants to do the job.???? 2).Who will be sent to work there?hasn’t been decided yet. 3).Whoever will be sent to work there?will be given a large house. 4).Whoever leaves the room last ought to turn off the lights.5). Could I speak to whoever is in charge of International Sales ,please? 6). Whoever wants to stay in a hotel has to pay their own way. 7).Who he is is not important. 3. whether与if 在作“是否”的意思讲时在下列情况下一般只能用whether，不用if：a. 引导主语从句并在句首时； b. 引导表语从句时； c . 引导从句作介词宾语时； d. 从句后有“or not”时； e. 后接动词不定式时。Whether there is life on the moon is an interesting question. 2.Everything depends on whether we have enough money. 3. I asked her if/whether she had a bike. 4. I don’t know if /whether he is well or not.5. I don’t know whether or not he is well.6. The question is whether he should do it.7.The doctor can hardly answer the question whether the old man will recover soon.8. I don’t know whether to go. 4.which引导名词性从句及定语从句区别。 which 引导定语从句时，是关系代词，要代替先行词在定语从句中作主语或宾语。 而引导名词性从句时，在从句中也作主语或宾语，但是是“哪一个”的意思。 1).There are so many interesting books in the bookstore,and I dont know which I can buy(=which to buy).(which引导宾语从句) 2).Here are 5 pairs. Can you tell