Question

quando usar were e wren`t, was e wasn`t

Answer 1

I was
You were
He, She, It was
You were
We were
They were

Was e were são passado do ver "to be"! Wasn't e weren't são nada mais do que o negativo das expressões, por exemplo: I wasn't good yesterday. = Eu não estava bem ontem. ^^

Se tiver dúvidas é só perguntar.

Answer 2

Hi!
Was/were são verbos que estão no passado. * PASSADO DO TO BE
Usamos was diante de he/she/it.
Example: She was at home (ela estava em casa).
Usamos were diante de you/they/we
Example: You were a good student.

Weren't e wasn't é a forma negativa de was/were.
Segue as mesmas regras diante de he/she/it -->wasn't or was not.
Diante de you/there/we --> weren't or were not.
Usamos para negar algo do passado.
Example: We weren't at home (nós não estávamos em casa).
Enjoy your studies!!