各种从句总结: 1
主语从句 引导主语从句的连词有:that,where; 疑问代词有:who,that,which; 疑问副词有:when,where,why,how; (1)that 引导的主语从句 That 在主语从句中无任何意义,不充当任何成分,通常不能省略
例句:That he will succeed is certain
他会成功是肯定的
常用it 作形式主语,而将that 从句置于句尾
例句:It is certain that he will succeed
他会成功,这是肯定的
若以that 从句为主语的句子是疑问句,只能用it 作形式主语
例句:Is it certain that he will succeed
确定他会成功吗
It 作形式主语位于句首时有以下四种结构: ① It+be+形容词+that 从句,例句:It is strange that no one wants to go there
真奇怪,竟然没有人想去那里
② It+be+名词词组+that 从句,例句:It is a pity that he can’t attend the party
真遗憾,他不能参加晚会
③ It+be+-ed 分词+that 从句,例句:It is said that he was a famous writer
据说他曾是一名著名的作家
④ It+seems/appears 等不及物动词+that 从句,例句:It seems that it is going to rain soon
看起来天马上要下雨了
(2)whether 引导的主语从句 例句:Whether she will go there is not known
还不知道她是否要去那里
(3)wh-疑问词引导的主语从句 例句:What we need is you