Modal verbs

We can use the modal verb "can" to:

• show ability in the present

• ask for/give permission

• give offers/suggestions

• express possibility

We use the modal verb "can't" to:

• express inability.

• things that are not necessary to do.

• prohibition.

• express posibility

We use the modal verb "must":

• to express obligation/duty.

• to show ability in the present.

• to ask for permission

• for something that you think is necessary to do.

We can use "mustn't":

• to express things that are not necessary to do.

• to express prohibition.

• to express obligation or duty.

• to express inability.

When do we only use have to?

• When it is the speaker's opinion.

• When it is not the speaker's opinion.

We use "don't have to" for:

• prohibition

• something that is necessary to do

• something that is not necessary to do

• inability

What are the other modal verbs we can use to replace "don't have to"?

• Needn't

• Don't need to

• Mustn't

• Can't

We use "should" and "ought to" to:

• ask for advice

• refuse permission

• give advice

• give permission

What is the other modal verb you can use to replace "should"?

• shoulder

• shuold

• to ought

• ought to

We use the modal verb "may" for:

• asking/ giving permission

• the month's name

• refusing permission

• expressing possibility