Japanese phrase
二度と___しないでください！ ni do to ___ shi na i de ku da sa i
Meaning
Please don't ever ___ again!
When to use it
Firmly asks that an action never happen again. It often shows anger or serious concern, although "please" makes the request slightly less blunt.
Example dialogue
また同じミスですか？ ma ta ona ji mi su de su ka
The same mistake again?
二度と同じミスをしないでください！ ni do to ona ji mi su o shi na i de ku da sa i
Please don't ever make the same mistake again!