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Expressing deduction

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This document discusses ways to express deduction and uncertainty in English using modal verbs such as MUST, MAY, MIGHT, and CAN'T. MUST is used when one is 100% certain of something. MAY is used when one is not very sure. MIGHT is used when one is not sure at all. CAN'T is used when something is impossible or untrue. Examples are provided for each modal verb.

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ExpressingExpressing DeductionDeduction
- When you are 100% sure100% sure, use MUST. She must have a lot of money. She drives a Ferrari. - If you are not very surenot very sure, use MAY: Theres someone outside, it may be John. He hasn卒t answered. He may not have seen my message.
- If you are not sure at allnot sure at all, use MIGHT: He might know the answer. Real Madrid might win the Spanish league. - If you are sure something is impossible/notsomething is impossible/not truetrue, use CAN卒T: He can卒t be ill. I saw him at a party last night.

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Expressing deduction

  • 2. - When you are 100% sure100% sure, use MUST. She must have a lot of money. She drives a Ferrari. - If you are not very surenot very sure, use MAY: Theres someone outside, it may be John. He hasn卒t answered. He may not have seen my message.
  • 3. - If you are not sure at allnot sure at all, use MIGHT: He might know the answer. Real Madrid might win the Spanish league. - If you are sure something is impossible/notsomething is impossible/not truetrue, use CAN卒T: He can卒t be ill. I saw him at a party last night.