高中英语语法主语从句讲解精编.docVIP

高中英语语法主语从句讲解精编 高中英语语法主语从句讲解精编 PAGE 高中英语语法主语从句讲解精编 高中主语从句 1.由连词that引导的主语从句:引导词that无含义/在句中不做成分/不可以省。 例如：That you will win the medal seems unlikely. 2. 用连词 whether 引导的主语从句: whether有含义(是否)/在句中不做成分/不可以省。 注意：引导主语从句，不能用if，只能用whether。 例如：Whether we will hold a party in the open air tomorrow depends on the weather. 3. 用连接代词引导的主语从句 在由连接代词who, whose, whom, which, what, whoever, whomever, whichever, whatever引导的名词性从句中，其连接代词在句中起名词性作用，担当一定成分. 例如：What you need is more practice. whatever, whoever在主语从句中不含疑问意义。它引导主语从句，并在从句中作主语、宾语、表语等。 Whoever breaks the law should be punished. （主语从句） （ ＝Anyone who breaks the law should be punished. ） 用连接副词when, where, why, how引导的名词性从句(其连接副词有含义,在句中作状语。) 例如:Where we should leave it is a problem. 三.注意点: it构成的主语从句 （1）由连词that引导的主语从句，在大多数情况下会放到句子的后面，而用代词it作形式主语。 例如：That light travels in straight lines is known to all. =It is known to all that light travels in straight lines. (但当what引导的主语从句表示“…的东西”时，一般不用it作形式主语。) 错:It is a book what he wants. 对:What he wants is a book. 另外，需要注意的是，it作形式主语代替主语从句时，要注意和as引导的定语从句的区别。试比较： It was reported that the US was under the terrorist attack. As was reported, the US was under the terrorist attack. （2）常见用it作形式主语的复合句结构 a It is +名词+从句 It is a fact that… 事实是…… It is good news that … ……是好消息 类似的名词还有：a pity；a wonder；a good thing；no wonder；surprise b It is +形容词+从句 It is necessary that … 有必要…… It is clear that … 很清楚…… It is likely that … 很可能…… It is important that … 重要的是…… 类似的形容词还有：strange; natural; obvious; true; good; wonderful; possible; unlikely; quite; unusual; certain; evident; worth-while; surprising; interesting; astonishing, etc. 需要注意的是，这类主语从句中，谓语动词很多为“（should）＋动词原形”，即要用虚拟语气。 c It is +过去分词+从句 It is said that … 据说…… It is reported that … 据报道…… It has been proved that … 已证明…… It must be proved that… 必须指出…… 类似的过去分词还有：known; estimated; expected; believed; thought; hoped; noted; discussed; required; decided; suggested; demanded; made clear;