Must not (You can't do it, it's a law, rule, obligation): You _______ _____ use your phone at work or class, You _______ _____ litter, Children _______ _____ sit at the front of a car, You _______ _____ lie, Don't have to (It's not necessary): You _______ _____ ____ buy a car , _______ _____ ____ be in the school lunch program, _______ _____ ____ bring your own lunch from home, _______ _____ ____ to pay for free lunches,

Must not vs Don't have to 1

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