全国大众英语测验语法——名词性that-从句
1）由隶属连词that指导的从句叫做名词性that-从句。 That只起连接主句和从句的感化，在从句中不担当任何身分，自己也没有词义。名词性that-从句在句中能充当主语、宾语、表语、同位语和描述词宾语，例如：
主语：That he is still alive is sheer luck.他还在世全靠命运。
宾语：John said that he was leaving for London on Wednesday.约翰说他礼拜三要到伦敦往。
表语：The fact is that he has not been seen recently.毕竟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，这一毕竟令办公室全部的人不安。
描述词宾语：I am glad that you are satisfied with your job.
你对义务满意我感到很愉快。
2）That-从句作主语每每用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.很清晰，整个计划注定要失落败。
It's 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-从句有以下四种不合的搭配干系：
a. It + be +描述词+ that-从句
It is necessary that…有需要……
It is important that…重要的是……
It is obvious that…很清楚……
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…已决议……
c. It + be +名词+ that-从句
It is common knowledge that………是知识
It is a surprise that…令人惊讶的是……
It is a fact that…毕竟是……
d. It +不及物动词+ that-分句
It appears that…好像……
It happens that…正巧……
It occurred to me that…我突然想起……

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