"in german a comma is mandatory before the conjunction that" in German In German a comma is mandatory before the conjunction 'that'. Im Deutschen muss vor "dass" zwingend ein Komma stehen. Detailed translations for "in german a comma is mandatory before the conjunction that" In German a comma is mandatory before the conjunction 'that'. In German a comma is mandatory before the conjunction 'that'. Im Deutschen muss vor "dass" zwingend ein Komma stehen.