名词性从句分为主从,表从,宾从和同位语从句. that引导主语从句时,that不可省略.如：That he is honest is known to all his friends. 表语从句的that不可省.如：The fact is that we are all eager to participate. 宾语从句中的that 可以省略.He said (that) he agreed with us. 同位语从句的that 不可省.The fact that the sun rises in the east is known to all.
