Question

como usar el was y el were

Answer 1

el was solamente se utiliza con he,I,she,it ( el was traduce estaba o era ) 
he was in the park - i was a fireman , she was killing. 
tambien el was se utiliza para el pasado continuo 
ej: i was walking in the street with my friends 
she was eating a donkey in the restaurant. 

el were se utliza on we,they,you ( el were traduce estaba o era, recuerda que es verbo to be ) 
you were a hitman - they were thieves - we were reading a book 
tambien lo puedes utilizar para el pasado continuo... 

Answer 2

Mira: 
El "Was" se utiliza para pronombres singulares como I , He , She , You
Ejemplo : " I was in the park with my friends yesterday"
                " Yo estuve en el parque con mis amigos ayer"
 El "Were" se utiliza para plural como We , They y You
 Ejemplo: " We were in Cartagena"
                "Nosotros estuvimos en Carrtagena"