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“先行”it
it的另一种用法是充当形式主语或形式宾语，后面的真正主语或真正宾语通常是不定式结构、-ing分词结构或名词性分句。it的这种用法叫做“先行”it。 例如：
It's difficult to remember all the numbers.
It was nice seeing you.
It's crazy her going off like that.
She made it clear that she didn't want to see him.
有时，后置的真正主语可以取代先行it的位置，而出现于句首，例如：
To remember all the numbers is difficult.
Her going off like that was crazy.
It用作先行主语时经常与以下各词类连用：
A.形容词：如difficult,easy,important,vital,etc.
It's easy to make mistakes.
B.名词：如fun,a pity,a pleasure, a shame
It's a pleasure for us to be here.
C.动词：如appear, happen, look, seem
It appears that he forgot to sign the letter.
三、分裂句引导词it
分裂句是以it为引导词的强调句型。它的结构形式是：It be + 主语 + that/who(m)...，例如：
It was a handbag that he brought her.
分裂句是由陈述句转换而来的，通过这种结构可以强调除谓语动词以外的大多数句子成分，例如：
Freda phoned Jack last night.
It was Freda phoned Jack last night. (强调Freda)
It was Jack who(m) Freda phoned last night. (强调Jack)
It was last night that Freda phoned. (强调last night)
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