回複：F1身份出了問題，緊急求助！！！

You will only have a problem IF your I-20 HAS ALREADY EXPIRED before your graduation, and you're now out-of-status. Next step will be to reinstate or to leave US.
But if it's still not expired, ISO can extend it, fix it easily, and you still have OPT for this time if not yet graduated.

從法律上講，如果一個學生最後一個學期結束，必須在多長時間內離境？for those who graduate, 60 days, for you, no grace period if not graduated.

如果我能在最後幾天內找一個新的I20，還能挽救我的F1身份嗎？ If current I-20 already expired, no, because you have no F-1 status now. You need to reinstate.