Choose the modal verbs which express:
obligation and necessity:
can
must
needn't
may
have to
would
offer:
need
shall
could
must
would
can
lack of necessity:
needn't
don't have to
can't
mustn't
don't need to
couldn't
prohibition:
can't
shouldn't
mustn't
don't have to
wouldn't
needn't
ability:
could
should
be able to
have to
may
can
deduction:
must
can't
ought to
might
may
could
advice:
shall
must
should
have to
ought to
will

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