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We use must when we feel sure that something is true because there’s very strong evidence. You have worked all day, you must be tired We use must have and couldn’t have plus the past participle of the verb to draw a conclusion about what happened in the past Sheila got a tan. She must have spent a lot of time in the sun lately. We use might, may or could to say that we think something is possible but we’re not sure. I heard a noise, there might be a cat on the roof.
We use can’t when we feel sure something is not true. That can’t be James, James wears glasses Making assumptions means using the information available to make a guess or draw a conclusion about the facts. How certain are you? Use these modal verbs: 100% - Completely or almost certain must, can’t, couldn’t 80% - Expecting to be certain should 50% - Maybe certain might, may, could Present and future forms: Might, must, may, may not, can’t, could Past forms – must have, can’t have; may might, could have, may not have…
He must have..... He may be.... + V-ing + past participle He can't... He could.... He might have.... + Past participle he must...