You have to/don't have to speak English during the lesson
have to
you must/mustn't do your homework
you must
you have to/don't have to study English for 5 hours every day to learn it.
don't have to
you have to/don't have to go to the US/Australia/the UK to learn English
You don't have to
you don't have to/you mustn't smoke during the lesson
you mustn't
you don't have to/mustn't wear a mask in the shops
don't have to
you can/can't go to Australia without a passport (from Spain)
you can't
you don't have to/you have to have a driving licence to drive a car
you have to
you don't have to/you mustn't drive on the left of the road in Spain
you mustn't!!
