If I were there it would not have been happened.
If he were minister He would have done so many things
I have seen such sentences. So I genuinely feel one doubt. Can I say?
If they was there or If We was there
If I were you (now), I would (do something in the present).
I I had been in your place (then), I would have (done something in the past).
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.
I've heard people said "If I was..." seemingly referring to the past in a hypothetical context. Is that an informal way of saying "If I had been..." ?
I'm also aware that "If I was..." can also refer to the present.
The simple past for "I am" is "I was." People who don't know about or care about the subjunctive will say "If I was" for an unreal situation in the present. You will hear that often, in fact. I'm not sure if it's used for an unreal situation in the past.
However, "they was" and "we was" are never correct. It is not correct for the simple past and it's certainly no more correct for the subjunctive. While there are people who use all sorts of non-standard grammar ("I seen it!"), do not follow that path.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.