- CARACTERÍSITCAS PROPIAS:
- Son verbos incompletos. No tienen participio ni infinitivo, y necesitan otros verbos para completar su conjugación: CAN se completa con la perífrasis BE ABLE TO, MUST con HAVE TO, etc.
- No llevan -S en la 3ª persona singular del presente simple, excepto HAVE TO (HAS TO)
- Todos van seguidos de otro verbo en infinitivo sin TO, excepto OUGHT TO, HAVE TO y NEED TO.
- Como no necesitan verbo auxiliar, construyen la interrogativa invirtiendo el orden del sujeto y el verbo, y la negativa añadiendo NOT.
VERB
USE
EXAMPLESNOTESPURE MODALS CAN
(presente)- Expresar habilidad - We can drive very well - Be able tocomplementa a cancuando indica habilidad y posibilidad: infinitivo, futuro, present perfect y gerundio, e.g. I will be able to play the guitar in a year.- Expresar posibilidad o imposibilidad - I can't talk, I've got a very sore throat - Expresar o pedir permiso - Can I sit down? - En negativa expresar deducción y prohibición. - She can't be at school. It's holiday.
- You cannot smoke here.COULD
(pasado)- Expresar habilidad en pasado. - Jane could drive before she was 18. - Pedir algo educadamente. - Could you pass the salt, please? - Expresar posibilidad o imposibilidad en el pasado. - It was so hot I couldn't walk in the sand. - Hacer especulaciones (posibilidad remota) - This passport could be his. - Hacer sugerencias. - We could play bingo today. - Remplaza a can en el estilo indirecto - They said they could do it themselves. - Expresar una crítica. - You could have bought some more food. MAY(PRE/FUT)- Pedir algo. - May I leave the classroom? - Cuando MAY indica posibilidad indica que algo no es seguro. (quizá, tal vez, puede que) - Expresar permiso. - You may go to the toilet. - Expresar posibilidad (presente o futura) - The headmaster may visit the class today. - Hacer especulaciones. - That may be the thief that was arrested by the police. MIGHT- Expresar posibilidad (más dudosa) - They might invite us to the party. - La posibilidad es muy dudosa (pudiera ser que) - Hacer especulaciones - They might have broken the window… SHOULD- Dar y pedir consejos (debería) - You should do more physical exercise - Expresar obligación moral o que algo no es lo adecuado que esperabamos - You should be more tolerant - Criticar acciones pasadas - She should have been quiet WILL- Hacer un ofrecimiento - I'll carry the suitcase for you. - Pedir algo educadamente - Will you bring me a coffee, please? SHALL
- Hacer un ofrecimiento - Shall I open the window? - Pedir sugerencias - What shall we do tonight? - Tomar decisiones - I shall speak to the headmaster WOULD- Hacer un ofrecimiento - Would you like some tea? - Rutinas en el pasado (afirm.) (solía) - When I was a child, I would go fishing. MUST
(presente)- Expresar obligación (autoridad fuerte) - You must go to school - HAVE TO complementa a MUST en los tiempos que este carece, e.g. She had to get up early yesterday. - En negativa: expresar prohibición - You mustn't smoke in hospitals - Expresar deducción (afirmativa) - They must be happy. They've won the lottery NEED- Expresar necesidad - Need we go now? - Con sentido pasivo - The trees need pruning. - En negativa: ausencia de obligación = don't have to - You needn't get up early at weekends OUGHT TO- Dar consejos - You ought to do more physical exercise - Expresar obligación moral - You ought to be more tolerant USED TO- Expresar hábitos o rutinas en el pasado - I used to play tennis, but now I play basket MODALS IDIOMS HAVE (GOT) TO- Expresar obligación (+ suave) - You have to be 18 to drive a car - En negativa: ausencia de obligación - You don't have to wear a uniform in this school HAD BETTER- Dar consejos o sugerencia (sería mejor) - It's getting dark, we'd better go home now WOULD RATHER- + infinitivo: preferir algo 2 sujetos iguales
- + Oración en pasado simple: (preferiría) sujetos diferentes
- + infinitivo + than + infinitivo- I'd rather stay at home (prefiero)
- I'd rather she studied harder
- I'd rather listen to music than danceBE USED TO+ -ING- Expresa "estar acostumbrado a.." - I'm used to going to bed late. GET USED TO+ -ING- Expresa " acostumbrarse a.." - I can't get used to his way of cooking. - FORMA PERFECTA DE VERBOS MODALES:
Se refieren al pasado: expresan conclusiones, suposiciones y conjeturas que hacemos sobre hechos pasados y se forman con un modal + have + participio.- MUST + HAVE + PARTICIPIO → conclusiones lógicas en el pasado, e.g. Sheila was absent yesterday. She must have been ill.
- COULD + HAVE + PARTICIPIO→ indica que hubo posibilidad de hacer algo en el pasado pero realmente no se hizo, e.g. He could have helped us, but he came too late.→ en negativa, expresa la incredulidad de que lo ocurrido sea cierto, e.g. She couldn't have said those words.→ para hacer una suposición en el pasado, e.g. She didn't come to the party. She could have been ill.
- MAY / MIGHT + HAVE + PARTICIPIO → expresan una suposición sobre el pasado, e.g. Call her again. She may / might not have heard you the first time.
- SHOULD / OUGHT TO + HHAVE + PARTICIPIO→ para lamentar que no se siguió un consejo en el pasado, e.g. She looks worse. She should / ought to have seen a doctor last week.→ para lamentar que no se haya cumplido lo que esperábamos, e.g. They should have been home by now.→ en negativa demuestran nuestra opinión crítica sobre algo que no debería haber ocurrido, e.g. I'm very angry with her. She shouldn't have been so rude.
Exercices:practice