Question

PARA QUE SIRVE EN WAS Y WERE

Answer 1

es un auxiliar. sirve para decir si es was en 3 persona (el ,ella ,eso)(she, he, it) 
y were para las demas (they, we, i, you..)

Answer 2

bueno, el "was" se utiliza para pasado simple (I, he, she and it), y el "were", para  (we, you, they).  Son para el pasado simple. I was (yo estaba o era), she was (ella estaba o era), y así .....