In this lesson, كَرُمَ is treated as an intransitive verb: its meaning is complete with its subject and does not normally require a direct object.
Example: كَرُمَ زَيْدٌ — Zayd became noble.
For comparison: نَصَرَ زَيْدٌ عَمْرًا needs a direct object, so it is transitive.
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Why This Bab Is Called Intransitive
Trilateral Bare Regular - Bab 5: Karuma Yakrumu & Intransitive Verbs
In this lesson, كَرُمَ is treated as an intransitive verb: its meaning is complete with its subject and does not normally require a direct object.
Example: كَرُمَ زَيْدٌ — Zayd became noble.
For comparison: نَصَرَ زَيْدٌ عَمْرًا needs a direct object, so it is transitive.