Modal verbs (resúmen)

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MODAL VERBS OF OBLIGATION (must, have to, should)

- OBLIGATION/NECESSITY: have to / must + infinitive

HAVE TOMUST

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|- More common for general, external obligations (rules and laws). |- More common for specific or personal obligations.|
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|I have to wear a shirt and a tie at work. (it’s the rule in this company) |I must buy a newshirt because this one is very old. (it’s my own decision) |
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|It’s a normal verb and it exists in all tenses.|- It’s a modal verb. The only forms are MUST and MUSTN’T. |
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|I had to wear a uniform at my primary school.| |
|You have to wear a seatbelt in a car....
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