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modal verbs - Coggle Diagram
modal verbs
NECESSITY
need
(semi-modal)
you needn't do it now
you don't need to do it now
need / needs / needed
we needn't have done it
possibility / probability
may/might
we might go to the beach
take your umbrella, it might rain
could
would (if)
should
that should be the postman
must
you must be tired
PROHIBITION
mustn't
can't
you can't smoke in here
(not allowed / permitted)
PERMISSION / ABILITY
can
could
pouvait/pourrait
be able to
can't / couldn't
may
(more polite)
may I use your pen?
OBLIGATION
must
I must call my sister
(I decide)
you must watch that film!
(defective verb)
have to
I have to pay tax
(external)
had to / will have to
NO OBLIGATION
don't have to
= you can if you want
you can come, but you don't have to
ADVICE
should/shouldn't
you should stop smoking
ought to
you ought to tell her