I just need clarification on a grammar point. As far as I know, if the answer to a Who question is a subject, we use Who was, even if the answer is plural e.g. Who was playing soccer?
If the answer is an object, it can be Who was OR Who were, depending upon whether we expect the object answer to be singular or plural in nature.
For some reason, Who were playing soccer? doesn't sit right, even if the answer is Bob and I were playing soccer.
I would love some clarification, and especially some links. I havent had any luck looking myself.