Modal verbs (resúmen)

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

- OBLIGATION/NECESSITY: have to / must + infinitive

HAVE TOMUST

| ||
|- More common for general, external obligations (rules and laws). |- More common for specific or personal obligations.|
| ||
|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) |
| ||
|It’s a normal verb and it exists in all tenses.|- It’s a modal verb. The only forms are MUST and MUSTN’T. |
|| |
|I had to wear a uniform at my primary school.| |
|You have to wear a seatbelt in a car....