It so happened that he had just left for Tianjin.

　　★ “It +动词的被动语态+主语从句”。常用于本句型的动词主要有accept, admit, allow, announce等。如： It’s accepted that the universe is endless.

　　It is generally admitted that he is a trustworthy person.

　　It was announced that all prisoners would be set free.

　　It was announced that the Prime Minister would speak on television that evening.

　　2. it作形式宾语 ★根据句子结构的需要，人们常用it作形式宾语，而将真正的宾语放在宾语补足语后。常用于这种句型的动词有believe, bring, consider, declare, feel, find, make, prove, think等。如： I find it amazing that anyone would want to listen to that music. I don’t think it possible to master a foreign language within 3 months.

　　I found it worthwhile reading this book. ★it作形式宾语的常用句型： 1）动词+ it + if / when从句 当enjoy, like, dislike, love, hate, prefer, appreciate等动词后需要接一个if或when引导的从句时，需要在动词后接it作形式宾语。如： She won’t like it if you arrive late.

　　He hates it when people use his bike.

　　I’d prefer it if I didn’t have to do so much work.

　　I would appreciate it very much if you would help me with it.

　　2）动词+介词+ it + that从句 能用于此句型的主要有：depend on, answer for, see to。如： You may depend on it that he will turn up in time.

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