why does this not fit "that wasn't why you drank, was it?"
i wonder why can't you say "right?" in this sentence? "That is not why you drank, right?"
"Das ist nicht .... oder?" is Präsens, "warum Sie tranken" is Imperfekt. You can't just change Präsens into Imperfekt even if there is a part of the phrase in Imperfekt.
Yep, sorry, I was just focusing on Sie tranken and automatically took the whole sentance as Imperfekt.
I sounded a bit more severe than I meant, because your mistake is logical.