A modal is a type of auxiliary (helping) verb that is used to express: ability, possibility, permission or obligation. Modal phrases (or semi-modals) are used to express the same things as modals, but are a combination of auxiliary verbs and the preposition to.

What are the 13 modals?

The principal English modal verbs are can, could, may, might, shall, should, will, would, and must. Certain other verbs are sometimes, but not always, classed as modals; these include ought, had better, and (in certain uses) dare and need.

What are the 20 modal verbs?

Modal auxiliaries: CAN, COULD, MAY, MIGHT, MUST, SHALL, SHOULD, OUGHT TO and WILL.