Have to /must

1-I MUST / HAVE TO VISIT MY FRIEND. IT IS HER BIRTHDAY.

2- SAM HAS TO / MUST WEAR UNIFORM AT SCHOOL.

3- YOU DON'T HAVE TO/ HAVE TO GO TO THE SUPERMARKET. I'LL DO

4- YOU DON'T HAVE TO MUSTN'T SWIM IN THIS PART OF THE RIVER. it is very dangerous

5- YOU MUST / DON'T HAVE TO DRINK A LOT OF WATER IN HOT weather.

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