The remaining positions include the second-person dual and plurals and the first-person forms. The long middle vowel is contracted before many consonantal endings.
PronounActive perfectPassive perfect
أَنْتُمَا (م)خِفْتُمَاخُفْتُمَا
أَنْتُمْخِفْتُمْخُفْتُمْ
أَنْتِخِفْتِخُفْتِ
أَنْتُمَا (ف)خِفْتُمَاخُفْتُمَا
أَنْتُنَّخِفْتُنَّخُفْتُنَّ
أَنَاخِفْتُخُفْتُ
نَحْنُخِفْنَاخُفْنَا
خِفْتُمْ ends in the masculine-plural second-person suffix, while خِفْنَا is first-person plural. Attached person markers are essential to meaning; the lexical root alone cannot supply person and number.