PROHIBITION MUSTN’T is usually used when the prohibition comes from the one who is speaking. CAN’T tells us that something is against the rules. EXAMPLES: You mustn’t smoke so much , it’s too bad ! You can’t take photographs in this museum .
PROHIBITION SHOULDN’T is used to give advice or to talk about what we think is right or wrong. EXAMPLES: You shouldn’t tell anybody of our secret. Everyone shouldn’t make fun of the persons with disabilities.
WRITING TASK Write a paragraph with 8-10 sentences expressing prohibition about the things that you are not allowed to at your age.
ABILITY CAN = present COULD = past BE ABLE TO = all other tenses EXAMPLES: I can’t drive a car but I can ride a motorbike . When I was 6, I could swim very well . In two years I will be able to drive a car.
PERMISSION CAN = informal COULD = polite MAY = formal REQUESTS CAN YOU…? = informal COULD YOU…? = polite WILL YOU…? = neutral
OBLIGATION There are two types of modal verbs of obligation: 1. Those that primarily express a firm obligation or necessity MUST = Present HAVE TO = Other tenses ( past , future …) EXAMPLES: We must treat each other with respect . I have to be back home at 11. When I finish school I will have to get a job .
OBLIGATION 2. Those that express a recommendation or moral obligation SHOULD s used to give advice to someone and to say that something is a good idea. It is used to express subjective opinion. OUGHT TO is more used in written language. It expresses an objective view. ( RECOMMENDATION OR MORAL OBLIGATION) EXAMPLES: If you are not feeling well, you should seek a doctor’s advice. I ought to know your reasons why you left the room during the meeting.
ADVICE SHOULD The government should protect people in need . It’s cold in here . You should turn on the heating . You shouldn’t tell anybody about this . It’s a secret .