He is to eat a balanced diet,___? (Make tag question)

He has to take regular physical exercise, doesn’t he?

A tag question is a short question added to the end of a statement. It is used to ask for confirmation or to check if something is true. To form a tag question, we generally use the auxiliary verb from the main statement and the pronoun corresponding to the subject.

In the given statement, "He must enjoy sound sleep," the auxiliary verb is "must." Since the statement is positive, the tag question must be negative. The subject is "He," so the pronoun remains "he." Therefore, the correct tag question is "mustn't he?"