A modal is a type of auxiliary (helping) verb that is used to express: ability, possibility, permission or obligation.f auxiliary verbs and the preposition to.
Can/could/be able to
Can, could and be able to are used to express a variety of ideas in English:
Present and Future:
can/can’t + base form of the verb
Tom can write poetry very well.
I won’t be able to visit you next summer.
To Offer of Assistance or Polite Suggestion (When you are quite sure of a positive answer)
Shall + subject + base form of the verb
Shall we go for a walk?
Note: Shall is only used with I or we. It is used instead of will only in formal English.
Fill in the blanks with the correct form of the following modals:
If you are sick, you ________ go to work. You’ll infect everyone there.
Drivers _______ stop at red lights.
You _______ finish the proposal today. You can finish it tomorrow.
She ______ hear much better with her new hearing aids.
______ I order us a bottle of wine?