Question

He is the boy we talked about him. 改错

Answer 1

你好

两种该法：

1. He is the boy we talked about  (他就是我们谈论过的男孩）we talked about作定语，修饰the boy.

2. He is the boy and we talked about him. 他就是那个男孩，我们讨论过他。

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Answer 2

去掉him
定语从句，省略了引导词 whom
即

He is the boy we talked about.