Условие задания:

3 Б.
Turn the given sentences into negative sentences (Преврати заданные предложения в отрицательные предложения). Don't put the full stops, they are given. (Точки не ставить, они даны)
Use: cannot, may not, must not, don't have to,  doesn't have to.
He can drive a car.
He cannot drive a car.
1. May he use the phone?
2. You have to wear a uniform at school.
3. You must read this book.