Modal verbs: Obligation, Prohibition and Advice

Presentation

Modal verbs

Obligation, Prohibition and advice

Modal verbs:

+info

Obligation

We use MUST and HAVE TO to express obligation

MUST

MUST shows us that the obligation comes from inside the speaker STRUCTURE: MUST + INFINITIVE

+info

HAVE TO

HAVE TO shows that the obligation comes from outside. This is usually refer to a rule or law. STRUCTURE: HAVE TO + INFINITIVE *Use do or does to make a question.

+info

LACK OF OBLIGATION

We use DON'T / DOESN'T HAVE TO or DON'T / DOESN'T NEED TO to show that there is no obligation. You can do something if you want but it is not an obligation. * It doesn't mean the same as MUSTN'T.

+info

Advice

We use SHOULD and OUGHT TO to express advice or make recommendations

ADVICE

STRUCTURE: SHOULD/SHOULDN'T + INFINITVE We can also use HAD BETTER to make our advice stronger, if you don't there would be some problem or danger.

+info

Prohibition

We use CAN'T and MUSTN'T to show something is not allowed.

PROHIBITION

STRUCTURE: CAN'T/MUSTN'T + infinitive

+info

EXERCISES

A. Complete the sentence using a Modal Verb 1. When we were at school we ______wear a uniform. 2. We _________ go to the meeting. Why didn't you go? 3. I ______ wear glasses, I still can see perfectly well. 4. We went to bed right after dinner because we ____get up early the following day. 5. We ------ talk to each other because it was an exam.

+info

EXERCISES

B. Choose the correct option: 1. You SHOULD / SHOULDN'T / HAVE TO eat too many calories, or you'll get fat! 2. She DON'T HAVE TO / DOESN'T HAVE TO / MUST tidy up now. I'll do it later 3. My brother HAVE TO / HAS TO / DOESN'T HAVE TO wear a tie at his work. He is a lawyer. 4. You MUSTN'T / MUST smoke in this office. It's a rule. 5. We MUSTN'T / DON'T HAVE TO forget to set the alarms before we leave

EXERCISES

C. Rewrite the sentences using the modal verbs given. 1. I think it would be a good idea for you to take a break. (should) 2. Students are allowed to buy cheap meals in the cafeteria. (can) 3. It's important that I remember to print out my essay. (must) D. Correct the underlined mistake. 1. Sally must go to bed early last night. 2. Students don't have to talk loudly in the library 3. Do we must hand in our homework today?

GIVE AND ADVICE

1. Try to give the best advice that you can for the following situations: I study at university. We have our final exams in two weeks. I'm very worried about my best friend. He is planning to cheat in the examination.s What should I do?

GIVE AND ADVICE

1. Try to give the best advice that you can for the following situations. My friends keep complaining that I spend too much time with my boyfriend/girlfriend. They say I never hang out with them anymore. I don't want to lose my friends, but at the same time, I want to see my boyfriend/ girlfriend as much as possible. What would you suggest I do?

¡Goodbye!

tamar.tapia.vasquez@americancollege.cl