Modal verbs are a reduced number of verbs in
English. They behave differently from the other verbs and share some
characteristics: they...
o
are
invariable, don’t take an –s in the third person: She must study for the test
o
go in
front of the verb in interrogative sentences: Should I open the door?
o
add “not”
or “n’t” in negative sentences: He
mustn’t leave the town
o
are
followed by infinitive without to (except ought to, need to, have to): She can’t sing.
o
are not
used in the past or the future. Instead, we use “be able to” and “have to”.
Modal verbs have different uses. 
Modal verbs can also be used followed by the perfect infinitive: modal + have + past participle.
You will find a short explanation and a complete set of exercises in this page.
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