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modal verbs - Coggle Diagram
modal verbs
PROBABILITY
could
might
should
must
100% sure
OBLIGATION
must
"I decide it's an obligation"
I must call my mother tonight
you must come for dinner
you must stop smoking
have to
had to
will have to
not my choice
I have to pay my tax
PERMISSION
can
may
polite
PROHIBITION
mustn't
you mustn't smoke in the office
can't
NO OBLIGATION
don't have to
you don't have to come with me
you can if you want
ADVICE
should/shouldn't
you should stop smoking
should I stay or should I go?
NECESSITY
need
semi-modal
she needs to leave at 9am
I needed to speak to him
we don't need to do it now
auxiliary
I needn't have done it
= it wasn't necessary to do it
we needn't have booked a table
= the restaurant was empty when we arrived