could
definitions
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modal verb
past tense of can; used to express possibility, ability, or permissionen: past tense of can; used to express possibility, ability, or permission
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modal verb
used to make polite requests or suggestionsen: used to make polite requests or suggestions
examples
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I could swim when I was five.
I could swim when I was five.
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Could you help me?
Could you help me?