The boy is old enough to know better.

这个男孩已经长大知道好歹了.

《简明英汉词典》

You are old enough to know better than to steal.

你已经长大了,应该知道不能偷窃.

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I am old enough to know better.

我已经长大,该懂得好歹了.

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Have you been drawing on the walls? I thought you were old enough to know better.

墙上是你画的 吧 ?我还以为你都懂事了呢.

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She is old enough to know better than to spend all her money on clothes.

她长大了,不会无知到把所有的钱都花在衣服上.

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She is old enough to know better than to spend all money on clothes.

她长大了应该懂得不该把钱都花在穿着上.

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