The past tense second person plural, as you're aware, has two distinct vocalizations, the "informal" one penultimately stressed like other forms and the "correct"/historical one, ultimately stressed. On another thread it was stated that Where is the ultimate stress still used in modern-day secular life? Is it not used even in university lectures/most political speeches, or is it considered very Israel/Judaism-specific? If a cursory peek into this 50-year-old Hebrew course is of any indication, I could guess that the formal stress pattern is considered even more archaic today than the -na verb forms in the feminine plural. (the latter is taught but the former is not.) Is that so?