Por que o certo é If I were ao invés de If I was - English Experts

Oi, pessoal Eu tenho uma duvida, ninguém consegue me responder e eu também não consigo descobrir. I was - past simple, coisa simples de se entender. If I were - Por quê? Não deveria ser If I was? Eu já li isso em livros, e eh muito comum de se ouvir..

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