This document discusses modal verbs in English that express functions like obligation, prohibition, permission, and more. It lists common modal verbs like have to, must, mustn't, don't/doesn't have to, can/can't, could/couldn't, should/shouldn't and provides examples of how to use each one. It also includes sections on obligation, prohibition, lack of obligation, ability, permission, and advice. There are practice exercises linked at the end.

2. INTRODUCTION
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Son un grupo de verbos que expresan
algunas funciones como obligación,
prohibición, permiso...
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Siempre van seguidos de un verbo en
infinitivo

3. OBLIGATION
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HAVE TO (tener que)
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I HAVE TO study hard
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He HAS TO study hard
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What DO you HAVE TO do?
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What DOES he HAVE TO do?
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MUST (deber)
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I MUST study hard
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He MUST study hard
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What MUST you do?

4. PROHIBITION
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MUSTN'T (no se puede, está prohibido)
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You MUSTN'T use your mobile phone in class
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He MUSTN'T use his mobile phone in class
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What MUSTN'T you do at school?

5. LACK OF OBLIGATION
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DON'T/ DOESN'T HAVE TO (no es
necesario, no hace falta que, no hay por
qué)
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You DON'T HAVE TO wear a uniform in this
school
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He DOESN'T HAVE TO wear a uniform in his
school
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What DON'T you HAVE TO do at school?
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What DOESN'T he HAVE TO do at school?

6. ABILITY
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CAN/ CAN'T (poder, saber, se usa en
presente)
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I CAN play the guitar
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He CAN'T speak Japanese
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CAN you cook?
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COULD/ COULDN'T (para el pasado)
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He COULD ride a bike when he was 6
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We COULDN'T speak English when we were 6
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COULD you speak when you were 6?

7. PERMISSION
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CAN/ CAN'T (poder)
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Mum CAN I go out tonight?
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No, you CAN'T
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Mum says that I CAN'T go out tonight
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CAN I open the window? It's very hot in here
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Yes, you CAN
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The teacher says that I CAN open the window

8. ADVICE
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SHOULD/ SHOULDN'T (debería)
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You SHOULD go to the doctor if you don't feel
well
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They SHOULD arrive on time
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We SHOULDN'T miss classes
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I SHOULDN'T tell lies

9. SOME PRACTICE
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Click here
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Click here
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Click here

10. SOME PRACTICE
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Click here
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Click here
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Click here