表语从句不能用what引导吗?

表语从句不能用what引导吗?
表语从句不能用what引导吗?

表语从句不能用what引导吗?
what可引导主语从句、宾语从句或表语从句
I like what she likes.（宾语从句,作宾语）
This is what I like.（表语从句,作宾语）
He is no longer what he used to be.（表从）他已经不是原来的他了.

可以.
This in not what I wanted to say.
这并不是我原本想要说的.

what是名词性从句常用引导词，当然可以引导表语从句。只要从句中缺少成份，则用what
如：That's what Idon't know.
Time is what we should treasure
China is no longer what it used to be.