can (ability; requests; permission) - could (ability; possibility; polite requests)
would (polite requests)
will (offer)
shall (suggestion; offer)should (advice) - ought to (obligation)
should have
may (possibility) - might (possibility)
have (got) to (obligation)
need (necessity)
needn’t (lack of necessity)
used to + infinitive (past habits)
Modals for Recommendations (must, have to, should, could)
Modals for Present Deduction (must, may/might, could)
Modals for Past Deduction (must have, may/might have, could have)
Table
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