He is not ----he used to be .(用that 还是what)解释

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Heisnot----heusedtobe.(用that还是what)解释Heisnot----heusedtobe.(用that还是what)解释Heisnot----heusedtobe.(用th

He is not ----he used to be .(用that 还是what)解释
He is not ----he used to be .(用that 还是what)解释

He is not ----he used to be .(用that 还是what)解释
用what.what是一个连接代词,作为连词引出表语从句,作为代词做从句的表语.that在引导名词性从句时充当的是纯粹连词,也就是说在从句中不能做成分,这样,从句中be之后缺少表语.不妨这样记忆:what 相当于两个词:名词+that.这个句子可以改为:He is not the person that he used to be.在这个句子中that是一个连接代词,引出定于从句,并在从句中作表语.
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