YOU SAID:

I have to go back to school or even though the class

INTO JAPANESE

私は学校に戻らなければなりません

BACK INTO ENGLISH

I have to go back to school

INTO JAPANESE

私は学校へ行かなければならない。

BACK INTO ENGLISH

I have to go to school.

INTO JAPANESE

私は学校へ行かなければならない。

BACK INTO ENGLISH

I have to go to school.