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Modal Forms

Listed below is a general outline of modal forms and their possible time reference.

Examples Form Time Reference
He can answer your question.
They should leave early tomorrow.
He had to leave at 7 this morning.
MODAL Simple Verb




He might be joking!

Modal Continuous Form


She can't have been serious!

They might have gone to the country.

Modal Verbs Present Perfect Past
They might have been working at that time Modal Present Perfect Continuous Verb Past

Modal Forms

Can / Could / Be Able to (ability, permission)

Must / Have to - Mustn't / Not Have to

Modal Verbs of Probability

More Grammar Reference
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