Modals

These are auxilliary/helping verbs that are usually used to express ideas such as permission, prohibition, obligation and others.

• conditionals

• modals

• adverbs

• linking verbs

It expresses a strong obligation or necessity.

• must

• should

• can

• may

It is the formal way to prohibit something.

• mustn't

• may not

• can't

• shouldn't

It suggests personal obligation. Weaker than “must”.

• have to

• must not

• should

• may

It is used when the prohibition comes from the speaker.

• wouldn't

• mustn't

• can't

• shouldn't

It is more formal and polite than can. It is used to say that someone was allowed to do something in the past.

• may

• might

• should

• could

Which of the following are the modals of obligation?

• can, may, could

• must, should, have to

• have to, mustn't , could

• mustn't, can't, may not

You _________ eat more vegetables. They are healthy for you.

• can

• may

• should

• mustn't

______ I have some coffee please?

• can

• should

• must

• mustn't

The passengers _________ wear their seatbelts at all time.

• should

• must

• don't have to

• may