

| SIGNIFICADOS/USOS | EJEMPLOS |
| 1. Se conjugan igual para todas las personas. |
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| 2. No se utilizan con otros auxiliares, excepto en los tiempos perfectos. |
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| 3. Son seguidos por el infinitivo (sin TO). |
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| 4. Se forma el negativo agregando not o la contracción -n’t. |
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| SIGNIFICADOS/USOS | EJEMPLOS |
| 1. La conjugación es diferente para la tercera persona del singular. |
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| 2. Se pueden usar con el auxiliar DO. |
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| 3. Van seguidos por el infinitivo con TO (Excepto por el negativo de need to) |
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| 4. El negativo de HAVE TO no se puede formar con la contracción –‘nt. |
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| SIGNIFICADOS/USOS | EJEMPLOS |
| CAN 1. Habilidad 2. Permiso 3. Petición 4. Posibilidad | 1. I can speak English. 3. Can you open the window? |
| COULD 1. Habilidad en el pasado 2. Petición formal 3. Permiso en Reported Speech 4. Posibilidad 5. Segundo condicional | 1. I could run fast when I was a child. 2. Could you open the window, please? 3. Mary said she could go out tonight. 4. Where’s Mary? I don’t know, she could be in her office. 5. If it didn’t rain, we could go to the park. |
| WILL 1. Certeza 2. Futuro: - decisiones espontáneas - predicciones 3. Promesas 4. Ordenes 5. Primer condicional | 1. He will definitely come to the party 2a. I will call Mary before she leaves. 2b. I think the economy will get better soon. 3. I will return your money tomorrow. 4. You will do as I tell you. 5. If it stops raining we will play football. |
| WOULD 1. Ofertas formales 2. Condicionales 3. Hábitos en el pasado | 1. Would you like some cheese? 2. If I had a car I would change my job. 3. On Sundays we would go to the park to play football. |
| SHALL 1. Futuro 2. Promesas 3. Pedir consejo 4. Para ofrecer ayuda 5. Pedir instrucciones 6. Ordenes | 1. I shall visit Mary next week. 2. I shall help you with your homework. 3. Shall I invite Jim to the party? 4. Shall I open the window for you? 5. Where shall I put this box? 6. You shall go there immediately |
| MAY 1. Posibilidad 2. Permiso 3. Petición formal 4. Ofertas formales | 1. I may be able to take a day off. 2. May I use your phone? 3. May I have some more cake, please? 4. May I help you? |
| MIGHT 1. Posibilidad | 1. We might be able to join you in London next week. |
| SHOULD 1. Recomendaciones 2. Sugerencias 3. Suposiciones 4. Consejo | 1. You should read this book, it’s great. 2. Perhaps we should consider a different option. 3. They should be at home by now. 4. You should see a doctor at once |
| OUGHT TO 1. Obligación moral 2. Recomendación 3. Probabilidad | 1. You ought to do as you are told. 2. You ought to see the Picasso museum. 3. They ought to be home by now. |
| MUST 1. Obligación 2. Necesidad 3. Deducción/suposición 4. Invitación | 1. You must wear protective glasses in the lab. 2. I must take my medicine. 3. They left at 8 o’clock, so they must be at home by now. 4. You must stay at my house when you come to the city. |
| HAVE TO 1. Obligación | 1. I have to wear safety goggles in the lab. |
| NEED TO 1. Necesidad | 1. I need to take my medicine with my breakfast. |
| SIGNIFICADOS/USOS | EJEMPLOS |
| CAN’T Certeza |
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| MUSTN’T Prohibición |
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| DON’T HAVE TO Innecesidad |
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