You should take warning from his example.

你应当把他作为前车之鉴.

《现代汉英综合大词典》

Happy is he who can take warning from the mishap of others.

幸福的人就是能从别人的不幸中引以为戒的人.

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We must take warning from this state of affairs.

我们一定要引为鉴戒.

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We must take warning from this story and not repeat their errors.

我们要把这件事引为鉴戒,不要重犯他们的错误.

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It doesn't matter that we make mistakes, what matters is that we take warning from it.

我们犯了错误不要紧, 重要的是以后要引为鉴戒.

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You should take warning from ( ie be warned by ) what happened to me.

你应以我的事情引为鉴戒.

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