Modals = auxiliary verbs that express speaker's attitudes/feelings.
-necessity.
-advise.
-permission - may,can
-possibility - might.
-ability = can,could
ex)
can
could
had better
may
might
must
ought to
shall
should
will
would.
modal + O.V
ex)
I can it (x)
I can do it (o)
==> Past
=> modal + have + P.P
= past form of modal verb.(Just same form - different means of present perfect)
ex) He might have been at the library yesterday.
Present perfect
=> I have been at the library several times.
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