I got in trouble and people said "he must have done something" Which one is correct? " must have done something" or "must have something done " do they mean the samethng?

1 Answer 1


They are correct but completely different. The first one means high probability of a past event seen from the Present. The second one refers to the necessity of having something done by someone. The second construction is a specific example of the Passive Voice. For example, I can't start my car. It must have broken down. I must have it fixed.

  • +1 for a correct answer. But it would help if you gave some examples of the use of each of them e.g. The service has improved, they must have done something and The roof's falling in, I must have something done (to fix it).
    – WS2
    Dec 1, 2018 at 8:51

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