前事不忘后事之师的英文：
[Literal Meaning]
past/matter/not/forget/later/matter/aux./teacher
Past experience, if not forgotten, is a guide for the future.

[解释]
把一前的经验教训作为以后的借鉴。

[Explanation]
One should learn from past experience.

[例子]
前事不忘，后事之师。你不应该在同一件事犯两次同样的错误。

[Example]
One should learn from past experience. You should not commit the same error on the same thing.

Remember the past and it will guide your future
前事不忘后事之师