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modal verbs
Presentation

MUST or HAVE TO

I must wear glasses. You must study hard.

MUST

It is only use at the present tense.It expresses a strong recommendation.

You mustn't touch the ball with your hands if you pay footballl..

MUSTN'T

It is only use at the present tense.It expresses a prohibited action.

You have to study hard if you want to pass the exam

HAVE TO

It is use to express when something is necessary.

You don't have to go to school today: it is Saturday.

DON'T HAVE TO

It is use to express when something is not necessary or obligatory.

Genially

"You don't have to study a lot, but you must study."