Was and Were
O was e o were são as formas no passado de am/ is / are
I am (sou, estou)
You are (é, está)
He is (é, está)
She is (é, está)
We are (somos, estamos)
You are (são, estão)
They are (são, estão)
Para as negativas no passado se adiciona o not
I was not
You were not
She was not
Para se perguntar não se utiliza o "did"
eg.: Did you go to the movies? (você foi ao cinema?)
Did you have breakfast? (você tomou café da manhã?)
Was she at the mall? (ela estava no shopping?)
Were you at school? (você estava na escola?)
I was (era, estava)
You were (era, estava)
He was (era, estava)
She was (era, estava)
We were (eramos, estavamos)
You were (eram, estavam)
They were (eram, estavam)
I wasn't
You weren't
She wasn't
Could and couldn't
Could é o passado do verbo can
I can (eu posso)
I could (eu pude)
Nas afirmativas ele funciona igual a qualquer outro verbo
I could get the bus on time (eu podia pegar o onibus a tempo)
I could travel on Friday night (eu podia viajar na sexta anoite)
Nas negativas não se usa o didn't
I could not meet you at the cafe (eu não podia te encontrar no cafe)
I could not make it in time (eu não podia fazer a tempo)
ou: I couldn't meet you at the cafe
ou: I couldn't make it in time
Para perguntar não se usa o did
Could she meet you at the station? (Ela podia te encontrar na estação?)
Could you pay it? (voce podia pagar?)
link com a explicação para o uso de:
Fale inglês Já