The active perfect ascribes selling to an agent, while the passive perfect foregrounds what was sold and the act of being sold.
PositionActivePassive
هُوَبَاعَبِيعَ
هُمَا (م)بَاعَابِيعَا
هُمْبَاعُوابِيعُوا
هِيَبَاعَتْبِيعَتْ
هُمَا (ف)بَاعَتَابِيعَتَا
هُنَّبِعْنَبِعْنَ
أَنْتَبِعْتَبِعْتَ
أَنْتُمَا (م)بِعْتُمَابِعْتُمَا
أَنْتُمْبِعْتُمْبِعْتُمْ
أَنْتِبِعْتِبِعْتِ
أَنْتُمَا (ف)بِعْتُمَابِعْتُمَا
أَنْتُنَّبِعْتُنَّبِعْتُنَّ
أَنَابِعْتُبِعْتُ
نَحْنُبِعْنَابِعْنَا
بَاعَ / بِيعَ distinguish active and passive by vowel pattern. Some contracted suffixed forms, such as بِعْتُ, may coincide in surface appearance; the context can determine the intended voice.