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Modals to express degrees of necesity
Transcript of Modals to express degrees of necesity
I have to go to the school
person + modal + verb on base form
sometimes we use shall instead of should on the questions
range of obligation
have got to
are not allowed to
weren't allowed to *
ought to have*
had better not
are supposed to
were supposed to*
are not supposed to
weren't supposed to*
don't have to
didn't have to*
present: simple modal
past: perfect modal
person + modal + have + past participle
you should have eaten your lunch
he is supposed to do the work
you could have practiced more
shall we get a new computer?