Cerrar
MODAL VERBS
CAN
COULD
BE ABLE TO
MAY
MIGHT
MUST
OR MUSTN'T
HAVETO/ HAS TO
DON'T/DOESN'T HAVE TO
SHOULD
OUGHT TO
MODAL PERFECTS
can't have
could have
may (not) have / might (not) have
must have
should have /
ought to have /
shouldn't have
needn't have (British)
Don't have to (American)
didn't have to
(Semimodal)
TAKEN FROM:
