When we feel sure about what happened...: must have + past participle, When we think it's possible that something happened...: might have + past participle, may have + past participle, could have + past participle, When we think it's not possible that something happened...: can't have + past participle, couldn't have + past participle, might not have + past participle, may not have + past participle,

Modals_deductions about the past_C1

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