• Hypothetic conditional: past
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  • If the "I love you" virus ______ (be) found earlier, forty-five million computers _________(not crash) in 2000.
    If the "I love you" virus had been found earlier, forty-five million computers wouldn't have crashed in 2000.
  • The development of modern medicine ______(be) different if Alexander Fleming ____ (not discover) penicillin.
    The development of modern medicine would have been different if Alexander Fleming hadn't discovered penicillin.
  • If John Lennon _______ (not meet) Paul McCartney, they ______(not form) The Beatles.
    If John Lennon hadn't met Paul McCartney, they wouldn't have formed The Beatles.
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