题目

He is no longer who he used to be.为何不可?（原题TOM is no longer ____he used to be.）
He is no longer what he used to be.
He is no longer the person who/that he used to be.
以上两个句子均正确
那为什么He is no longer who he used to be.不行呢?
希望英语高手能够回答,这是一个有关表语从句的问题,一直困惑着我!
老师讲：what=the thing that
那么who不可以=the person who吗?
难道who 不可以引导表语从句吗?（应该可以,请看这个句子： The question is who will travel with me to Beijing tomorrow.
是正确的!）
帮忙解释一下
补充：针对5楼的答案：He is no longer who that he used to be.这样修改以后对吗
原句不对是因为少了一个that吗?按道理,作为定从表语的关联词确实不可以省略!
期待高手回答
有满意的答案悬赏可至200分!

提问时间：2020-08-07

答案

你可以分写两个句子来理解一下,
He is no longer a theif.
He used to be a thief.
如果对第二句中的a thief 提问的话,应该问what did he use to be?而不是 who did he use to be?
然后尝试合并一下这两个句子,就得到了He is no longer what he used to be.
而He is no longer the person who/that he used to be.这一句其实是一个表语从句中套有一个宾语从句,the person是表语,而后面的who/that he used to be是the person的定语从句.
而The question is who will travel with me to Beijing tomorrow.这个句子之所以看起来很像你写的那个句子,其实不然,这个句子的主语是question,也就是说问题是,是什么呢,就是who 引导的那个问句.举个例子来说,比如上课老师问你这样一个问题：“who will travel with me to Beijing tomorrow.”然而你没有挺清楚,你可以问你的同桌：“what's the question?"这时你同桌给你的答案就是The question is who will travel with me to Beijing tomorrow.
看起来你对各种从句还不是很清楚,可以找一些不同的从句自己多分析分析,理解一下.