Peter ________ worry about money because he's independently wealthy.
needn't or doesn't have to/need to
She ________ study harder if she wants to pass the exam.
must
I _______ take two trains to get to work every day.
have to
You ________ be late for class.
mustn't
You __________ pay to use the motorways in England. They are free.
needn't or don't have to/need to
My doctor told me I’m overweight and I _________ go on a diet.
have to
When the traffic lights are red, you _______ go.
mustn't
He _____ stop smoking if he wants to be healthy.
must
These pants don’t fit me anymore. I _______ lose weight.
must
The students _________ use their mobile phones during lessons.
mustn't
Motorcyclists _________ wear a helmet.
have to
We _________ work on Saturdays so we can do what we want.
needn't or don't have to/need to