find the mistakes :لهواة اللغة الانجليزية

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احد الشباب الامريكى يقول
When correct grammar sounds incorrect
"If I were she, I'd sign up for that class."

This is correct grammar, but it sounds so odd to my ear because I never hear anyone saying it this way. Is it becoming accepted as correct the same way as the "was/were" issue? "If I was a member, I'd..."