MODAL VERBS OF OBLIGATION

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MODAL VERBS OF OBLIGATION

SHOULD/SHOULDN'T

ADVICE

We shouldn't stay up until late

We should leave early

HAVE TO

Rules, laws, coming from OUTSIDE

All tenses

Do-Does for questions

-s in the 3rd person singular

MUST

PERSONAL obligation

You MUST see the doctor

only present form

followed by infinitive without to

Ex. I MUST do my homework