Question

He is going to school. He going to school. He goes to school. He is goes to school. 对错和区别？

麻烦告诉为什么好不？为什么He is going to school一定得加is?

Answer 1

He is going to school.他将去上学。
He goes to school.他去上学。
其他两句是错的，现在分词不能单独使用，之前必须有be动词，同理句中有be动词的时候，后接动词必须用ing形式。

Answer 2

He is going to school. 对，他要去学校（准备去，还没去）
He going to school. 错
He goes to school.他去学校（一般现在时）
He is goes to school. 错

Answer 3

He is going to school正确，他打算去学校，相当于将来时He will go to school.
He goes to school.他去学校，一般时

加is是因为固定的be going to do sth. 表将来时 ,he后面用单数，所以用is going to....