i could swim when i was six years old为什么用swimi could swim when i was six years old为什么用swim而不是swimming

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i could swim when i was six years old为什么用swimi could swim when i was six years  old为什么用swim而不是swimming
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i could swim when i was six years old为什么用swimi could swim when i was six years old为什么用swim而不是swimming
i could swim when i was six years old为什么用swim
i could swim when i was six years old为什么用swim而不是swimming

i could swim when i was six years old为什么用swimi could swim when i was six years old为什么用swim而不是swimming
can/could/should/would/may/might 后面是要用动词原形的

情态动词后面接动词原形,所以用swim.

could 后面接原型。swim