ABILITY - can / can’t / could / couldn’t / be able to / not be able to, DEDUCTION - must, POSSIBILITY - may / may not / might / might not / could, IMPOSSIBILITY - can't, NECESSITY / OBLIGATION - have to / must, NO NECESSITY - not have to / needn’t, PROHIBITION - must not / can’t, ADVICE - should / shouldn’t / ought to, PERMISSION - can / may,

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