Special conditional — necessity under a descriptive condition + non-permanence in itself.
Special customary — descriptive continuity + non-permanence in itself.
Existential non-necessary — actuality + non-necessity.
Existential non-permanent — actuality + non-permanence.
Special temporal — necessity at an appointed time + non-permanence.
Dispersed — necessity at an unspecified time + non-permanence.
Special possibility — non-necessity of both affirmation and negation.
The source separately clarifies the force of lā-dawām and lā-ḍarūrah; these create distinct compound modes.
It then opens Bāb al-Sharṭiyyāt, where connected and disjunctive conditional propositions are treated in detail.