Ted: What was your teacher’s name?
Kim: Mrs Parker.
Ted: Was she nice?
Kim: Yes, we all loved her!
Ted: Who were your best friends?
Kim: Anna and Kate. They’re next to me in the photo.
Ted: Who were the clever pupils?
Kim: George was clever. He’s behind me in the photo.
Ted: Who were the naughty pupils?
Kim: John, the blond boy in the corner, was very naughty.
Ted: Were you naughty?
Kim: No, I wasn’t. I was very good!
Формы was употребляются с единственным числом и с I, а were — с you и формами множественного числа.