1) We use these modal verbs to express present and past ability or future possibility in the passive. a) can, could, may, might, will, would b) should c) must, ought to, should d) could, can't, may, might, must 2) We use these modal verbs to give criticism of something that happened in the past.  a) can, could, may, might, will, would b) should c) must, ought to, should d) could, can't, may, might, must 3) We use these modal verbs to talk about necessity and advisability in the passive.  a) can, could, may, might, will, would b) should c) must, ought to, should d) could, can't, may, might, must 4) We use these modal verbs to talk about deduction and speculation in the present or the past. a) can, could, may, might, will, would b) should c) must, ought to, should d) could, can't, may, might, must

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