True, We use must + infinitive when we are almost certain something is true about the present., We use may, might, and could when we are not sure about something., To make deductions about the past, we use modal verb + have + past participle., They must be at home. This sentence expresses a strong deduction about the present., We use modal verb + be + V-ing to make deductions about actions happening now., He can't be sleeping. This means the speaker believes it is impossible that he is sleeping., False, We use can't + infinitive when we think something is possible., We can use can to make deductions., She must have forgotten her keys. This sentence is about the present., He might be studying. This means the speaker is completely sure., They could have left early. This sentence is a deduction about the future., Must and can't express the same level of certainty as may, might, and could.

ODF DEDUCTION

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