The past subjunctive of to be is always were in formal English. Was is used in informal style for the 1st and 3rd person singular. In other words, you can say if I was/were but you can never say if they was.
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khoshtipSo your last sentence; "you can say if I was/were but you can never say if they was." is in informal state as well, yes?I'm not sure what you mean.
khoshtipIf I say, "If I was ...." it's not wrong but it's informal", right?Right! - CB