名词性从句中,that的省略

1）引导主语从句和同位语从句的连词不可省略,如：
That she was chosen made us very happy.
We heard the news that our team had won.
2）宾语从句或表语从句中that有时可以省略,
由连接词that引导宾语从句时,that在句中不担任任何成分,在口语或非正式的文体中常被省去,但如从句是并列句时,第二个分句前的that不可省.例如：
　He has told me that he will go to Shanghai tomorrow.
　We must never think (that) we are good in everything while others are good in nothing.
表语从句（在复合句中,位于系动词之后作表语的从句叫表语从句.引导表语从句的关联词与引导主语从句的关联词大致一样,表语从句位于连系动词后,有时用as if引导.其基本结构为：主语 + 系动词 + that从句.）
　The fact is that we have lost the game.

名词性从句that省略只有一种引导宾语从句是可以省略的，其他的如作主语、表语、同位语不省略
he knew (that) he had to pass the exam