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Can we use causative have with modal must. Suppose

  1. you must have had those document published by you.
  2. you must have the documents prepared by someone.

Are these idiomatic and grammatical. actually i am experimenting with these.

  • Yes, you can - although your first sentence requires documents (plural) and needs to drop by you. Your second sentence is fine. The first sentence is saying that it is you who had the documents published. The second is saying that it is necessary for you to get someone to prepare the documents. – Ronald Sole Oct 9 at 21:48
  • @Ronald sole thank you – Deep Oct 9 at 21:55
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Yes you can, although this grammar has a fairly specific usage. Ordinarily it expresses a perceived reason for something, for example:

These documents must have been written by you, (because ...)

These documents must have been prepared by someone else (because ...)

This can also be used to describe a situation:

"She must have come here before us -- look, you can see the tracks of her shoes in the snow!" Edward shouted. "Quick, don't let her get away!"

or a person:

Oh you must've been a beautiful baby
'Cause baby look at you now

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