Use

Modals express ability, probability, obligation, advice, and permission.

Example:

He can finish the test today, but he might finish tomorrow.

Explanation:

We use the modal can to express ability. We use the modal might to talk about possibility. He is able to finish the test today, but it is possible that he will finish it tomorrow instead.

How to build

Modals are usually used with other verbs.

The modal verbs are: can, could, may, might, must, ought to, shall, should, will, and would.

• It is possible for me to take the train→ I might take the train.

• I am required to take the tube → I must take the tube.

• It is a good idea for me to take the bus → I should take the bus.

• I am going to take the train→ I will take the train.

• I cannot take the tram, but I wanted to → I would take the tram, but I cannot.

Modals do not change form for different subjects.

• I can drive to the station.

• She can drive to the station.

Modals do not change form for the past tense. Sometimes, a different modal is used for the past tense.

• They can go to the store → Can is used because they are able to go to the store now, in the present tense

• They could go to the store yesterday → Could is used to talk about ability in the past tense

To ask a question with a modal, you switch the order of the subject and the modal:

• He could be elected president → Could he be elected president?

• They will be on time for the bus→ Will they be on time for the bus?