Is it correct to use it as an obligation? Yes. Are they correct?
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AnonymousShe must have her homework done by tomorrow.Is it correct to use it as an obligation?Yes.
AnonymousShe may have her homework done by tomorrow.She could have her homework done by tomorrow.Are they correct?Yes, as possibilities.
AnonymousIs it correct to use it as an obligation?Yes.
AnonymousAre they correct?Yes.