Modals (also called modal verbs, modal auxiliary verbs, modal auxiliaries) are special verbs which used to express: ability, possibility, permission or obligation. They give additional information about the function of the main verb that follows it.
Here are some characteristics of modal verbs:
They have no -s in the third person singular (he, she, it).
Most modal verbs, except for ought, are followed by the verb without to.
Modal verbs have no infinitive or -ing form.
They make questions and negative forms without using do/did.
Here is a list of modals:
can / can't
could / couldn't
may / may not
shall / shall not
will / won't
should / shouldn't
ought to / ought not to
might / might not
would / wouldn't
must / must not
Modal verbs are used to express functions such as:
Permission
Ability
Obligation
Prohibition
Lack of necessity
Advice
possibility
probability
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