Modals to express degrees of necessity
examples
I have to go to the school
form
person + modal + verb on base form
shall
sometimes we use shall instead of should on the questions
examples
expectation
range of obligation
obligation
positive
must
have to
have got to
had to*
negative
must not
cant
are not allowed to
weren't allowed to *
advice
positive
negative
had better
should
ought to
should have*
ought to have*
had better not
shouldn't
shouldn't have*
expectation
positive
negative
are supposed to
were supposed to*
are not supposed to
weren't supposed to*
suggestion
no obligation
could
might
could have*
might have*
don't have to
didn't have to*
present: simple modal
past: perfect modal
person + modal + have + past participle
100
0
you should have eaten your lunch
obligation
advice
he is supposed to do the work
you could have practiced more
suggestion
simple modal
perfect modal
simple modal
perfect modal
shall we get a new computer?
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Modals to express degrees of necesity
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