在名词性从句中,什么时候用WHAT做连接词?

what从句相当于汉语的"的"字省略结构,一说"....的",如"老师说的...".你可以把它做好几种从句.What the teacher said is right. 主语从句/.This is what the teacher said.表语从句/ I rememnered what the teacher said.宾语从句.又如:我看到的: What I saw...