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 is common 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 2) It is + adj. +从句
It’s certain that…
肯定…
It is possible that...
很可能……
It is unlikely that...
不可能……
It is obvious that… 很明显…
It is necessary important natural... that…
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