高考英语语法复习课件-名词性从句[3].ppt

名词性从句 by Will Smiles 在句子中起名词作用的句子叫名词性从句.分为:主语从句、宾语从句、表语从句和同位语从句。 名词从句的功能 功能相当于名词词组, 它在复合句中能担任主语、宾语、表语、同位语、介词宾语等，因此根据它在句中不同的语法功能，名词从句又可分为四类 引导名词性从句的连接词 可分为三类：1.连接代词that,whether,if 不充当从句的任何成分） 　  引导名词性从句的连接词 2.连接代词：what, whatever, who, whoever, whom,whose, which.不仅起到连接一个句子的作用，同时也是从句的一个组成部分。 　 3.连接副词：when, where, how, why 　 引导主语从句不可省略的连词： 介词后的连词 引导主语从句和同位语从句的连词不可省略。 同位语从句 在一个更长的句子中作同位语使用的句子叫同位语从句。 同位语与其前的词或短语表达的是同一事物。如： The fact that she is ill should be considered. 同位语从句一般在下列词的后面 belief, fact, fear, hope, idea, news, problem, reason, result, possibility等。如： I have no idea when he will return. 不同连词引导的同位语从句 引导同位语从句的连词除that外，还可以用how, when, where, why, 等。 He can’t answer the question how he got the money. 不同连词引导的同位语从句 I should like to know the reason why you changed the plan. I have no idea when she will be back. 主语从句 在另外一个句子中做主语的句子叫主语从句。How the book will sell depends on its author. That he is the best student in the class is obvious 主语从句常用it作形式主语放句首 因而我们常见到这种句式： It+be+n./adj/-ed从句（that, whether,etc.) 例：It's a pity that you should have to leave. It is great that I have a teacher like you. whether与if均为“是否” 但下列情况下只用whether ： 1. whether引导主语从句并在句首 Whether he will come is not clear. 2. 引导表语从句  The question is whether he’ll come. 3. whether从句作介词宾语 I’m not sure about whether we’ll win. 4. 从句后有"or not" Whether you like it or not, you ‘ll have to do it. 表语从句 在另外一个句子中作表语的句子叫表语从名。 The fact is that he has not been seen recently.　 宾语从句 在另一个句子中做宾语的句子叫宾语从句。 I worry about whether he can pass through the crisis of his illness. 宾语从句 Now I want to know what I can do. John said that he was leaving for London on Wednesday * * * * * *