He is a student,isn't he?He is a student,is not he?哪一个正确

He is a student,isn't he?He is a student,is not he?哪一个正确
He is a student,isn't he?He is a student,is not he?哪一个正确

He is a student,isn't he?He is a student,is not he?哪一个正确
isn't he 正确

两个都正确，只是不同的写法。 isn't 即为 is not.

He is a student, isn't he?正确。他是一个学生，难道不是吗？