表语从句不能用what引导吗?

问题描述:

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.