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MODAL VERB (Obligation: To express that someone causes another person to…
MODAL VERB
Obligation:
To express that someone causes another person to do something.
Obligation (strong)
Present
have to/have got to must
need to
am obliged to
am required to
Past
had to/had got to
needed to
was obliged to
was required to
Obligation (mild)
Present
should
ought to
am supposed to
Past
should have
ought to have
was supposed to
lack of obligation / prohibition
don't have to
it's not necessary but you can
example
The best thing is I don't have to work
present
-don't have to
-don' need to
-needn't
-am not obliged to
-am not required to
past
-didn't have to
-didn't need to
-needn't have
-wasn't obliged
-wasn't required
mustn't
you're not allowed to
example
Mum says I mustn't write anymore
present
-can't
-oughtn't
-shouldn't
-am not supposed to
-am not allowed to
past
-couldn't
-oughn't to have
-shouldn't have
-wasn't supposed to
-wasn't allowed to
Permission
to say that someone IS allowed to do something
am allowed to
Was allowed to
Can
could
May
might
Ability
express ideas like ability, permission, possibility, and necessity
past
could
was able to
managed to
Present
can
manage to
am able to