高中英语主语从句-课件（PPT精）

r not was not clear. Real 引导主语从句在句首只能用 whether , 有 it作形式主语的 whether/if 都可以. Conclusion: if If×注意: 由 that 引导的主语从句有时为了使句子结构平衡, 避免“头重脚轻”, 常用 it 作形式主语, 而把从句放在后面。例如: 1. That he will refuse this piece of advice is impossible. _______________________________________ _______________________________________ 2. That they should like each other is natural. _____________________________________ * it为形式主语 It is natural that they should like each other. It is impossible that he will refuse this piece of advice. 这样就构成了下面一些常用句型: 1) It is + n. + 从句 It is a pity/shame that... 遗憾的是…… It is a surprise that …令人惊奇的是… It is a fact that ……是事实 It mon knowledge that ……是常识* _______________( 很遗憾)we lost the match. * ______________( 这是事实)he cheated in the exam. It is a pity that It is a fact that