〜ないでください
Please don't do somethingmachine translation
FormationVerb ない-form + でください
Use 〜ないでください when you want to politely ask or request that someone not do something.
How to form it: verb ない-form + でください. It is the "negative version" of 〜てください.
Compared with 〜てはいけません (an outright prohibition), 〜ないでください sounds much softer and more polite, so it suits strangers or people above you.
Examples
教室で食べないでください。
Please don't eat in the classroom.
ドアを開けないでください。
Please don't open the door.
電気を消さないでください。
Please don't turn off the lights.