main reason
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main reason
The most important cause or the decisive reason for an event, a decision, or a situation.
Der Hauptgrund für den Umzug war die neue Arbeitsstelle in einer anderen Stadt.
The main reason for the move was the new job in another city.
'Hauptgrund' is a compound noun made up of 'Haupt-' (main) and 'Grund' (reason). The prefix 'Haupt-' means 'most important' or 'central', so the main reason is the most important reason of all.
Es gab viele Probleme, aber der Hauptgrund für die Kündigung war das schlechte Gehalt.
There were many problems, but the main reason for the resignation was the poor salary.
The prefix 'Haupt-' is very useful because it can be combined with many nouns to indicate their most important or central version. Examples include 'Hauptstadt' (capital city), 'Hauptgang' (main course), or 'Hauptproblem' (main problem).
Das Hauptproblem bei dem Projekt ist der knappe Zeitplan.
The main problem with the project is the tight schedule.
'Hauptgrund' is often used in two patterns: either with the preposition 'für' (for) and a noun in the accusative, or followed by a subordinate clause with 'dass' (that) or 'warum' (why).
Der Hauptgrund für seine gute Laune war das schöne Wetter.
The main reason for his good mood was the beautiful weather.
reason / ground
'der Grund' and 'der Hauptgrund' both refer to a cause or reason. 'der Grund' is general: there can be one reason or several reasons. 'der Hauptgrund' is the most important reason among several. The words can be confused because both answer the question 'Why?'. If you are naming just one cause, or do not want to say that it is the most important one, 'Grund' fits. If you mean the decisive or most important point, 'Hauptgrund' is more precise.
Der Hauptgrund für den Kurswechsel ist der Wunsch nach besseren Arbeitszeiten.
The main reason for the change of course is the desire for better working hours.
Für die Absage gibt es einen einfachen Grund: Max ist krank.
There is a simple reason for the cancellation: Max is sick.