We DON'T HAVE TO / MUSTN'T come to school on Saturdays
DON'T HAVE TO
You CAN'T / SHOULD / SHOULDN'T do your homework every day
SHOULD
I CAN / CAN'T / COULD climb trees when I was 7 years old
COULD
She is 15 years old. She MUST / MUSTN'T / DOESN'T HAVE TO drive a car
MUSTN'T
He HAVE TO / HAS TO cook dinner tonight
HAS TO
