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Anonymous Posted 9 years ago
Grammar

Must/May for deduction?

What's the difference between "may" and "must" for deduction?
Must-when you are 100% sure?
"May" when not?

They must/may be out. There aren't any lights on.
Your certainty make the difference?
  

Top answer

Must - when you are 95% sure? "May" when not? They must be out.

  • Must - when you are 95% sure?
  • "May" when not?
  • They must be out.
  • There aren't any lights on.
  • ) They may be out.
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3 Answers
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Must - when you are 95% sure?
"May" when not?

They must be out. There aren't any lights on. (They always turn out the lights when they leave.)
They may be out. There aren't any lights on. (They might be sleeping.)
They have gone out. There aren't any lights on. (You are 100% sure.)
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I highly appreciate your answer.

He drives a new Porsche. He must/may be rich.

Are both possible?
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He drives a new Porsche. He must be rich.

He drives a new Porsche.
Usually we make such observations to support a judgment on a person's wealth. So "he may be rich" is grammatical, but does not follow the logical train of thought.

He drives a new Porsche, but his shoes are worn out and his clothes are ten years out of style. He may be up to his ears in debt.

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