主语从句的用法高频考点专题 主语从句是在复合句中充当主语的从句，通常放在主句谓语动词之前或由形式主语it代替，而本身放在句子末尾。  1. It 作形式主语和it引导强调句的比较  It 作形式主语代替主语从句，主要是为了平衡句子结构，主语从句的连接词没有变化。而it引导的强调句则是对句子某一部分进行强调，无论强调的是什么成分，都可用连词that。被强调部分指人是也可用who/whom。例如： It is a pity that you didn’t go to see the film.  2. 用it 作形式主语的结构   (1) It is ＋名词＋从句  It is a fact that … 事实是…     It is an honor that …非常荣幸  It is common knowledge that …是常识   (2) it is ＋形容词＋从句  It is natural that… 很自然…         It is strange that… 奇怪的是…   (3) it ＋不及物动词＋从句  It seems that… 似乎…          It happened that… 碰巧…  新概念英语网课 新概念第三册mp3英音版 新概念英语第一册单词表打印  (4) it is＋过去分词＋从句  It is reported that… 据报道…         It has been proved that… 已证实…  3. 主语从句不可位于句首的五种情况   (1) if 引导的主语从句不可居于复合句句首。   (2) It is said , (reported) …结构中的主语从句不可提前。例如：  It is said that President Jingo will visit our school next week.   (3) It happens…, It occurs… 结构中的主语从句不可提前。例如：  It occurred to him that he failed in the examination.   (4) It doesn’t matter how/whether …结构中的主语从句不可提前。例如：  It doesn’t matter whether he is wrong or not.   (5) 含主语从句的复合句是疑问句时，主语从句不可提前。例如：  Is it likely that it will rain in the evening?  4. What 与that 在引导主语从句时的区别  What 引导主语从句时在从句中充当句子成分，如主语．宾语．表语，而that 则不然。例如： What you said yesterday is right.  1. Neither of t hem ______ going to the cinema. Both of them _____ going to the cinema. A. is ; are B. is ; is C. are ; was D. are ; is 2. All but one _____ here just now. All that I want to say  ____ this. A. was; were B. was; is C. were; i s D. were; were 3. A number of students ____ gone for an outing. The number of the students ______ increasing year. A. have; has B. is; have C. has; have D. have; is 4. Some of the oranges ______ turned bad. Some of the milk _______ turned sour (酸). A. have; has B. have; have C. has; have D. have; is 5. Each student -_ ___ got an English- Chinese  dictionary. The students each ______ a dictionary. A. have; has B. has; have C. have; have D. has; has 答案 1—5  ACDAB