What Happened "at" Dinner?

In the Eating and Drinking frame, the preposition "bei," is used for English "at." Typically, "bei" is used to talk about something that happened during a meal (e.g. "Beim Mittagessen haben wir viel gesprochen"). As above, the same contraction ("beim") is used with each meal term (e.g. "beim Frühstück").