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Anonymous Posted 10 years ago
Grammar

Perfect modals

She could have her homework done by tomorrow. For uncertainty.
She must have her homework done...
She has to have her homework done...
She has got to have...
She could have her homework done by the following day. For past time.

Are they correct?
  

Top answer

I think they can be correct. Am I right?

— Anonymous

  • I think they can be correct.
  • Am I right?
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2 Answers
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I think they can be correct.

Am I right?
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The first four are correct, but they are not perfect forms. Have to and Have got to are not modals.

These are modal perfect forms: She could have done/must have done
AnonymousShe could have her homework done by the following day. For past time.
That does not, as a stand-alone sentence, refer to past time.
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