Passive Voice of "The teacher may punish you".

You should be punished by the teacher.

You will be punished by the teacher.

You shall have been punished by the teacher.

You may be punished by the teacher.

The correct transformation of "The teacher may punish you" into passive voice is "You may be punished by the teacher."

This sentence accurately reflects the possibility expressed by "may" in the original sentence while shifting the focus to "you."