Question

qual a diferença de was e were no future tense​

Answer 1

Não entendi a pergunta pois

was

were

são do verbo to be (no passado)

e a pergunta refere ao futuro tense?

exemplo future tense (afirmativa) com o verbo to be

usando going to

I am not going to drink homemade wine. 

[Eu não estou indo beber vinho caseiro.]