He is no longer the one that he used to be.
这句that引导定语从句可以理解。
以下两句是否都可以成立呢?差别是什么?
He is no longer what he used to be.
He is no longer that he used to be.
He is no longer what he used to be.= He is no longer the one that he used to be.
He is no longer that he used to be. 这是错句。that为to
be的宾语,所以that为关系代词。可这里并不需要定语从句,而是需要名词或名词性从句作表语。这是很明显的错误,你看不出来实属不该。一个从句首先要判断它是什么从句,作什么成分。不能稀里糊涂的。
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