I mean in places such as Iraq, Syria,Palestine,Egypt and North Africa I understand Islamization would have led to urban elites, bureaucracy etc. adopting Arabic for maintaining their status but how did uneducated rural countryside especially peasants, nomads, pastoralists etc. adopt a foreign language when they had no reason to be educated or pickup Arabic. How did Arabization work in uneducated masses. Why would an Egyptian peasant just give up centuries old mother tongue and pick up language of an invader?