alharaka: in this case we should start teaching all as following:
2 => hamza (batee' = bate2 = slow)
3 => ayen (Saree' = Saree3 = Fast)
5 => khaa' (Khaer = 5er = well-being)
6 => Taa' (Tareek = 6areek = road)
7 => haa' (Bahrain = Ba7rain = country name)
9 => sad (soof = 9oof = wool)
but i don't think that it is correct to teach the complicated things from the beginning