Why not? Maybe you are on a train and your friend decided to go to the toilet before you go to the restaurant to get a beer and a bratwurst. Could you not say ‘ich warte auf meinen Freund im Zug’?
Why not? Maybe you are on a train and your friend decided to go to the toilet before you go to the restaurant to get a beer and a bratwurst. Could you not say ‘ich warte auf meinen Freund im Zug’?