The Gateway to Arabic" series is a well-structured progressive course that has been designed to teach Arabic to non-Arabic-speakers from a broad age range. As students progress in building up their knowledge of Arabic grammar & vocabulary they are able to put into practice the skills they have acquired through written drills spoken passages of dialogue & comprehension exercises. " Gateway to Arabic Book Four" builds upon the knowledge of first form regular past & present tense verbs acquired in Book Three of the series by introducing the student to the concept of first form hollow doubled root letter & hamzated verb forms. It also further develops the student's knowledge of ordinal & cardinal numbers & the rules governing them & teaches the use of numbers in telling the time as well as for counting."