What to remember about the form of modals?
A modal does not change according to the number or person of the subject.
Examples: He can learn. I can learn. You can learn.
They can learn. We can learn.
A modal is always used with a verb in its basic form (infinitive)
Examples: I can run. I may run.
I could run. I might run.
Modals can be used alone in response to a question.
Examples: Can you sing? I can.
Will you sing? I will.
Will you come? I may./I will.
Modals, when joined with ‘not’ to form a negative, can be contracted.
Examples: I cannot run. I can’t run.
I do not run. I don’t run.
I will not run. I won’t run.