YOU SAID:

Whowever did this will be punished by the teachers.

INTO JAPANESE

これをした者は誰であれ教師によって罰せられるでしょう。

BACK INTO ENGLISH

Anyone who does this will be punished by the teacher.

INTO JAPANESE

こんなことをする人は先生に罰せられます。

BACK INTO ENGLISH

Anyone who does this will be punished by the teacher.