Chapter 1. Overview of the Arabic language, its history and diversity. Chapter 2. Background on the five varieties under study (Moroccan, Egyptian, Levantine, Gulf, and Standard Arabic). Chapter 3. Verbal and Nominal Morphology of the five varieties (verbal and nominal paradigms, their features and distributions). Chapter 4. Tense , Aspect, and Modality in the five varieties.

Chapter 5. Agreement and Concord in the five varieties. Chapter 6. Negation and Negative Constructions in the five varieties. Chapter 7. Nominal Constructions in the five varieties. Chapter 8. Relative Clauses, Questions, and Conditionals in the five varieties.

Chapter 9. Verb classes and verbal alternations in the five varieties. Chapter 10. Prepositions and Particles in the five varieties. Chapter 11. Morpho-syntax of Diglossic discourse. Chapter 12. Diachronic issues in the five varieties and their historical relations with each other.

Chapter 13. Acquisition of Arabic as First Language, Second Language, and Heritage Language.