我五岁的时候就能自己系鞋带了。

我五岁的时候就能自己系鞋带了。

When I was five, I could tie my shoes by myself.

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When I was five, I could tie my shoes by myself.

could 是情态动词 can 的过去式,表示"能够、可以",在这里指过去具备某种能力。

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