that引导主语从句

　　that引导主语从句时不同于其他的连词，既无词义也不作成分，只起单纯的连接作用，且通常不可以省。为了强调that引导的主语从句而置之于句首时，that不可省。

　　①That the driver could not control his car was obvious.

　　②That she was chosen made us very happy.

　　③That he will come is certain.

　　④That he would take the risk is true.

　　⑤That he should have married her isn't surprising.

　　★通常，that引导主语从句时用it做形式主语，把从句置于句尾，此时that有时可省。例如：

　　①It was obvious that the driver could not control his car.

　　②It made us very happy that she was chosen.

　　③It is certain that he will come.

　　④It is true that he would take the risk.

　　⑤It isn't surprising (that) he should have married her.

　　★如果以that从句为主语的句子是疑问句，就只能用先行词it结构。例如：

　　①Is it certain that he will come?

　　②Is it true that he would take the risk?

　　▲it做形式主语有以下几种不同的结构：

　　(1)It + be + 形容词+ that-从句

　　①It is likely that he will come.

　　②It is strange that she has ever trusted him.

　　③It is important that he (should) attend the meeting.

　　④It is best that he (should) go.

　　此句型在表示惊讶、喜悦、遗憾等感情色彩时，that从句中的谓语动词也常用 (should) + v原形。

　　It is strange that no one should have objected to the plan.

　　(2)It + be +名词+ that-从句

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

　　It's a pity that he should have catched the train.

　　(3) It + be + -ed分词 + that从句

　　It is said that he is a famous writer.

　　It is reported that there will be a storm this afternoon.

　　▲在表示建议、要求、命令等意义的被动结构中，that从句中的谓语动词常用(should) do。(参见虚拟语气部分)

　　It is suggested that the meeting (should) be held this afternoon.

　　It is demanded that he (should) leave at once.

　　(4) It + seem/happen/appear等不及物动词 + that从句。(look不接that从句，它接to be结构或形容词)

　　It seems that he is wrong.

　　It appears that they are in urgent need of help.

　　He looks (to be) surprised/happy/sad.

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