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Modal verbs, Obligation, Certainty, Advice, Permission, Possibility, no -…
Modal verbs
MUST
(100% sure)
have+past participle
yes :
Should
Ought to
yes
can
Obligation
yes
must
have to
will have to (future)
would have to (conditional)
had to (past)
no
dont have to
Certainty
SHOULD
(quite sure)
have+past participle
Advice
Shouldnt
Permission
no
mustnt
cant
Possibility
could
if...
might
may
no