（2）常见用it作形式主语的复合句结构

　　It is +名词+从句

　　It is a fact that… 事实是……

　　It is good news that … ……是好消息

　　It is a question that … ……是个问题

　　It is common knowledge that … ……是常识

　　类似的名词还有：a pity；a wonder；a good thing； no wonder； surprise等。

　　例如：It is a mystery to me how it all happened.

　　It is common knowledge that the whale is not a fish.

　　It is no surprise that Bob should have won the game.

　　It’s a pity that you missed the film.

　　 It is +形容词+从句 It is necessary that … 有必要…… It is clear that … 很清楚…… It is likely that … 很可能…… It is important that … 重要的是…… 类似的形容词还有：strange; natural; obvious; true; good; wonderful; possible; unlikely; quite;

　　unusual; certain; evident; worth-while; surprising; interesting; astonishing, etc. 例如：It is doubtful whether she will be able to come.

　　It was really astonishing that he refused to talk to you.

　　It is essential that he should be here by the weekend.

　　It seems obvious that we can not go on like this.

　　It is necessary that you （should）master the computer.

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