Question

That is why he didn't come to school yesterday.

That is why he didn't come to school yesterday.把句子改成:
That is why his not coming to the school yesterday.

这样改对吗？

Answer 1

你好，有问题就问，这个学习态度值得肯定
第二句中That is why his not coming to the school yesterday.这句话中的his是不能这样用的，his单独不能作为一个成分，需要结合其他词语一起，才能组成一个句子成分
如： his apple ， his book
回到题目上来
That is why he didn't come to school yesterday.
原题意思为：这就是为什么他昨天没来学校的原因。
这里，是昨天的事情，所以是过去式
要改写的话，就要说，昨天的这个状态
改为：
That is why he was not at school yesterday.这是过去式的状态
如果要写成过去进行时，则是这样：
That is why he was not coming to school yesterday.

追问

我想把why引导的表语从句改成一个短语结构。不在用从句，而是用短语。用his做coming的逻辑主语。

追答

好的，谢谢补充
his not coming to school这个其实是个短语，但是why后面不能只跟一个短语的，why后面要跟一个完整的句子
that is why后面跟的是结果,译为：“那是（为什么）.的原因”
例如：
Tom overslept this morning.That is why he was late for work.
汤姆今天早晨睡过头了.那是他上班迟到的原因.

追问

Oh, I see

I appreciate your help

Answer 2

不对，你这样改从句里面就缺少了谓语。