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名词性that

　　1)由从属连词that引导的从句叫做名词性that-从句。 That只起连接主句和从句的作用，在从句中不担任任何成分，本身也没有词义。名词性that-从句在句中能充当主语、宾语、表语、同位语和形容词宾语，例如：

　　主语：That he is still alive is sheer luck.　他还活着全靠运气。

　　宾语：John said that he was leaving for London on Wednesday.　约翰说他星期三要到伦敦去。

　　表语：The fact is that he has not been seen recently.　　　事实是近来谁也没有见过他。

　　同位语：The fact that he has not been seen recently disturbs everyone in his office.

　　近来谁也没有见过他，这一事实令办公室所有的人不安。

　　形容词宾语：I am glad that you are satisfied with your job.

　　你对工作满意我感到很高兴。

　　2)That-从句作主语通常用it作先行词，而将that-从句置于句末，例如：

　　It is quite clear that the whole project is doomed to failure.　很清楚，整个计划注定要失败。

　　Its a pity that you should have to leave.　你非走不可真是件憾事。

　　用it作形式主语的that-从句有以下四种不同的搭配关系：

　　a. It + be +形容词+ that-从句

　　It is necessary that　　　有必要

　　It is important that　　　重要的是

　　It is obvious that　　　　很明显

　　b. It + be + -ed 分词+ that-从句

　　It is believed that　　　　　人们相信

　　It is known to all that　　　从所周知

　　It has been decided that　　已决定

　　c. It + be +名词+ that-从句

　　It is common knowledge that　是常识

　　It is a surprise that　　令人惊奇的是

　　It is a fact that　　　　事实是

　　d. It +不及物动词+ that-分句

　　It appears that　　　　　　似乎

　　It happens that　　　　　　碰巧

　　It occurred to me that　　我突然想起

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