Usages of der Grund
Was ist der Grund? Warum sagst du die Party ab?
What is the reason? Why are you cancelling the party?
Niemand kennt den Grund. Deswegen können wir nicht helfen.
Nobody knows the reason. Because of that we cannot help.
Die Explosion, deren Grund geheim ist, war gefährlich.
The explosion, whose reason is secret, was dangerous.
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