主语从句 在复合句中，作主语的从句称为主语从句。 一、主语从句的引导词及其在句中的功能 (一)连接词that和whether [观察例句] 1．That she could come to help us made us very happy. 2．That the big earthquake had killed many people frightened people all over the world. 3．Whether we go by train or by boat makes no difference. 4．It is still unknown whether the plan will be carried out. [归纳用法] 1．that引导主语从句，在从句中不充当任何成分，仅起连接作用，但不能省略。 2．whether引导主语从句，在从句中不充当任何成分，起连接作用，但有自己的意义，不可省略。 [名师点津] whether引导的主语从句既可放在句首，也可放在句尾(前面需用it作形式主语)。 (二)连接代词who，whose，whom，what，which，whichever，whoever，whomever，whatever等 [观察例句] 1．Who will take his place is not important. 2．What role he will play in the film hasn't been known. 3．Whatever you do in your spare time should do no harm to others. [归纳用法] 连接代词引导主语从句，并在从句中作主语、宾语或定语。 (三)连接副词when，where，how，why等 [观察例句] 1．Where the English evening will be held has not yet been decided. 2．When we will have a meeting is an important question. 3．Why John was late for the class has been unexplained. [归纳用法] 连接副词引导主语从句，并在从句中作状语。 [即学即练1] 单句语法填空 ①It doesn't matter whether you pay in cash or by credit card in the store. ②What makes the book so extraordinary is the creative imagination of the writer. ③When the delayed flight will take off depends much on the weather. 二、主语从句与形式主语it 1．It be＋名词词组＋主语从句 常用于这种句型的名词词组有a pity，a shame，a fact，an honour，a wonder，no wonder等。 It's a pity (that)you can't attend my birthday party. 很可惜你不能参加我的生日聚会。 It's no wonder that she speaks English so well. 难怪她英语说得那么好。 2．It be＋形容词＋主语从句 It is obvious that the manager of the coffee shop was waiting for Li Fang to leave. 很明显咖啡店的经理在等李方离开。 It is very important that a student (should)learn English well. 学生学好英语很重要。 3．It be＋过去分词＋主语从句 It's suggested that the old man (should)go home to have a rest. 建议这位老人回家去休息一下。 It is said that that is where the famous singer was born. 据说，那就是那位著名的歌星出生的地方。 4．It＋不及物动词(happen，seem，appear，etc.)＋主语从句 It seems to me that you disagree to the plan. 在我看来，你好像不赞成这个计划。 It happened to me that I had been away when he called. 他打电话时，我正好不在家。 5．It＋及物动词＋宾语＋that从句 It surprised him that they came to visit him suddenly. 让他吃惊的是他们突然来看他。 It worried her a bit that her hair was turning grey. 她的头发在变白，这让她有点担心。 [即学即练2] 单句语法填空 ①It remains to be seen whether the newly formed committee's policy can be put into practice. ②It suddenly occurred to him that he had left his keys in the office. ③It is often the case that anything is possible for those who hang on to hope. 三、主语从句的注意事项 (一)从句的语序 [观察例句] 1．Whichever of you g ... ...
