German phrase
Bei wem habe ich ~?
Meaning
At whose place did I ___?
When to use it
It asks whose place it was. Use it to check where something happened. It is casual with friends.
Example dialogue
Bei wem habe ich meinen Schlüssel liegen lassen?
At whose place did I leave my key?
Bei Tom. Er hat ihn.
At Tom's. He has it.