〜ないでください

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Combine the ～ないで form of a verb with ください to politely request someone "not to do" something.

E.g. 食たべる → 食たべないで → 食たべないでください "please don't eat"

This sounds more polite than simply requesting that someone not do something using only ないで.

Summary

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  ～ないでください is a polite way to ask someone "not to do" something