can is - a modal verb, can has - only present and past forms, "can" in the past is - "could", we use "be able to + infinitive" - instead of can for other tenses, we use "be able to + infinitive". - for ability and possibility, we can't use "can" - in future, present perfect, gerund, as an infinitive, could - is past and a conditional forms of "can", we can use "be able to + infinitive" - in present and past, usually if we want to be more formal,

Intermediate unit 4b

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