1)There *was* a piano on the stage;
2)Ethan's voice *wasn't* very loud;
3)We *were* excited about the concert;
4)Why *were* Anna and Kate tired?
5)*Were* you at home?
6)All our friends *were* in the audience;
7) Leo and Seb *weren't* at the concert.
8)What *was* the name of the play?
Употребляя was/ were, помните, что was употребляется с местоимениями I, he, she, it, а were - с местоимениями we, you, they.