Question

A diferença entre was e were

Answer 1

WAS e WERE são as formas do passado do verbo TO BE
I / he / she / it --> WAS
you / we / they --> WERE. :-)

Answer 2

Was é usado para indicar uma frase no passado dos pronomes no verbo TO BE : I, He, She , It
Were é usado para indicar uma frase no passado dos pronomes no verbo TO BE: You, We , You(plural) , They.

Quando a frase relata uma suposição sempre devemos usar Were indiferente do pronome 
Ex : I wish I were rich!

Espero ter ajudado!
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Boa noite!