Rule 1: 1. The accusative predicate and word order
After any verb of this family the predicate takes the accusative: an indefinite singular ends in ـًا (مَرِيضًا), a sound masculine plural in ـِينَ (مُجْتَهِدِينَ), a sound feminine plural in ـَاتٍ with kasra (مُجْتَهِدَاتٍ), a dual in ـَيْنِ. The usual order is verb, subject, predicate, and the verb agrees with its subject as any verb does: singular when the subject follows, full agreement when the subject is a pronoun (كَانُوا, كُنْتُ). A predicate that is a prepositional phrase or a whole clause has no visible case: كَانَ الْمُدِيرُ فِي مَكْتَبِهِ, كَانَ الْوَلَدُ يَبْكِي. A short predicate may come before the subject: كَانَ فِي الْقَاعَةِ رِجَالٌ كَثِيرُونَ.
كَانَ الْعُمَّالُ مُتْعَبِينَ.
kāna l-ʿummālu mutʿabīna
The workers were tired.
Sound masculine plural predicate in ـِينَ.
كَانَتِ الْمُعَلِّمَاتُ حَاضِرَاتٍ.
kānati l-muʿallimātu ḥāḍirātin
The women teachers were present.
Feminine plural predicate: accusative ـَاتٍ with kasra.
كُنَّا صَغِيرَيْنِ يَوْمَ مَاتَ جَدُّنَا.
kunnā ṣaghīrayni yawma māta jaddunā
We two were small on the day our grandfather died.
Dual predicate in ـَيْنِ; كُنَّا is the pronoun form 'we'.
كَانَ الطَّبِيبُ يَفْحَصُ الْمَرْضَى.
kāna ṭ-ṭabību yafḥaṣu l-marḍā
The doctor was examining the patients.
A verbal clause as predicate: no case ending to show.
كَانَ فِي الْمَعْرِضِ زُوَّارٌ كَثِيرُونَ.
kāna fi l-maʿriḍi zuwwārun kathīrūna
There were many visitors at the exhibition.
Prepositional predicate first, indefinite subject after: 'there was/were'.