one-word modals
can
could
may
might
must
should
will
would
shall - VERY LOW FREQUENCY, very polite invitation
"Shall we take our ten-minute break?"
"Shall we go?"
"Shall we dance?"
two-word modals
got to - casual, good for speaking
"I got to pick up my friend."
had better
have to
need to
ought to
supposed to
used to
three-word modals
be able to
be going to
be supposed to
have got to
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