Ability - can, could, be able to, manage to (I manage to memorize 10 new words every lesson), Possibility - can, could, may, might (He could be still in the office. I might want more cake later), Permission - can, could, may, be allowed to, let (You can come in), No permission - mustn't, can't, couldn't, may not, be allowed to (You can't borrow my phone), Obligation/necessity - must, have to, be supposed to (Drivers have to wear a seatbelt in the car), Absence of obligation/necessity - don't have to, don't need to (Alice doesn't have to wear formal clothes at work), Prohibition - can't, mustn't, may not (You can't park here, it's forbidden), Advice - could, should, shouldn't, had better (You should see a doctor), Requests - can, could, may, will, would (Will you please be quiet?), Offers/suggestions - can, shall, would like, could (Would you like some water?), Deduction - must, might, may, could, can't (They can't be brothers - I know he's the only child),

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