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2013年12月英语六级基础语法解析之表语从句

2013年12月英语六级基础语法解析之表语从句
  表语从句
  构成方式:
  若从句为陈述句,直接加that;
  若从句为特殊疑问句:直接保留特殊疑问词,后面的句子变成陈述句语序;
  若从句为一般疑问句:先把一般疑问句变成陈述句语序,然后在其前加上weather或者if;
  eg:China is no longer what she used to be.
  The question is who is responsible for what has happened.
  (4)主语从句:主语变成一个句子
  构成方式: 若从句为陈述句,直接加that;
  若从句为特殊疑问句:直接保留特殊疑问词,后面的句子变成陈述句语序;
  若从句为一般疑问句:先把一般疑问句变成陈述句语序,然后在其前加上whether或者if;
  位置:直接置于句首;
  eg:That the college will take in more students is true.
  Whether he will come or not hasn't been decided.
  Why he isn't here is not clear to everyone.
  it 做形式主语的情况:
  (1)It is+名词+主语从句;
  eg:It is a pity that you should have to leave.
  (2)It is+形容词+主语从句;
  eg:It is clear that the whole project is due to failure.
  如果是It is necessary/important/strange/natural+that引导的主语从句,从句中的谓语动词一定要用should+动词原形;
  eg:It is necessary that one should master the skills of operating computer.
  (3)It is+过去分词+主语从句;It is said/planted/expected…
  eg:It is said that President Bush will visit our school next week.
  (4)It is+不及物动词+形容词表语形式+主语从句;
  eg:It seemed certain that he will win the prize.
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