1． It作先行主语和先行宾语的一些句型
She had said what it was necessary to say.
2． 强调句型
It is not who rules us that is important, but how he rules us.
3． “All+抽象名词”或“抽象名词+itself”（very+形容词）
He was all gentleness to her.
4． 利用词汇重复表示强调
A crime is a crime a crime.
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