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CAN / CAN'T, Max, could, Affirmative, Question, Negative, They can'…
CAN / CAN'T
It's a modal verb
It means that it is always followed by the verb in infinitive. The form is the same for all subjects.
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We use it to express
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Permission/request: I can use my parents' car when they aren't home.
Can I go to the toilet, please?
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PAST TENSE
COULD / COULDN'T
To talk about ability or possibility in the past. It is followed by a verb in infinitive, same as can.
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Relax, dear. I can cook dinner tonight.
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Relax, dear. Can I cook dinner tonight?
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