Japanese phrase
___は使わないでください。 ___ wa tsuka wa na i de ku da sa i
Meaning
Please do not use ___.
When to use it
A polite request not to use a particular thing. It is common in notices and everyday instructions, and sounds firm but not harsh.
Example dialogue
教室では、携帯電話は使わないでください。 kyō shitsu de wa kei tai den wa wa tsuka wa na i de ku da sa i
Please do not use mobile phones in the classroom.
はい、気をつけます。 ha i ki o tsu ke ma su
Okay, I will be careful.