Due to the rapid expansion of Islam in the 8th century, many people learned Arabic as a lingua franca. For this reason, the earliest grammatical treatises on Arabic are often written by non-native speakers. The efforts of three generations of grammarians culminated in the book of the Persian scholar Sibāwayhi. "Sibawayh (Sibuyeh in Persian, سيبويه S?bawayh in Arabic, سیبویه)...