1. The book recognizes nine classes of noun case-marking; we studied only the first.
2. This first class takes ḍamma for nominative, fatḥa for accusative, kasra for genitive.
3. It covers the singular sound-final fully declinable noun, certain wāw/yāʾ-final equivalents, and the fully declinable broken plural.
4. The book's examples are زَيْدٌ، دَلْوٌ، ظَبْيٌ، رِجَالٌ.
5. Subjects are nominative, direct objects accusative, and nouns after a preposition genitive in these examples.
The next lesson takes up the second class in the source; first complete this level's quiz.