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有哪些用途，在从句中不担任任何成分，本身也没词义。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，比如：
主语：That he is still alive is sheer1 luck. 他还活着全靠运势。
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.事实是近来哪个也没见过他。
同位语：The fact that he has not been seen recently disturbs everyone in his office.
近来哪个也没见过他，这一事实令办公室所有些人不安。
形容词宾语：I am glad that you are satisfied with your job.
你对工作认可我感到非常高兴。
2）That-从句作主语一般用it作先行词，而将that-从句置于句末，比如：
It is quite clear that the whole project is doomed2 to failure.非常了解，整个计划注定要失败。
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-从句有以下四种不一样的搭配关系：
a. It + be +形容词+ that-从句
It is necessary that 有必要
It is important that 要紧的是
It is obvious that 非常明显
b. It + be + -ed 分词+ that-从句
It is believed that大家相信
It is known to all that从所周知
It has been decided3 that 已决定
c. It + be +名词+ that-从句
It is common knowledge that 是知识
It is a surprise that 让人惊奇的是
It is a fact that 事实是
d. It +不及物动词+ that-分句
It appears that好像
It happens that碰巧
It occurred to me that 我忽然想起
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