he said that they must work hard.这里后面的that代表什么?

问题描述:

he said that they must work hard.这里后面的that代表什么?

典型的宾语从句,that为连接词,无意义可有可无吗??不带他的话,影响整个意思吗?that一般跟在动词之后,在宾语从句中不做成分,可以省略,不影响整个句子