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 didnt go to see the film.
It doesnt interest me whether you succeed or not.
It is in the morning that the murder took place.
It is John that broke the window.
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 is +不及物动词+从句
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