名词性that从句怎么用?
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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 she is still alive is her luck.她还活着全靠运气.

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.

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… 众所周知……

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-从句

It appears that… 似乎……

It happens that… 碰巧……

It occurred to me that… 我突然想起……

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