Question

If you don't behave yourself the teacher ___
Punish you. (Shall/must)
Fill the correct modal in the blank.

Answer 1

If you don't behave yourself the teacher shall punish you.

Explanation:

• Both options are correct in the given sentence.

• When it comes to command someone "will" and "shall" roles change, the "will" is then used with the first person and "shall" is used with the second and third person.

• Whereas, "must" is used when necessary things happen in the present and future.

Answer 2

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If you don't behave yourself the teacher shall punish you.