Ḥāl describes a condition during an event: «جَاءَ زَيْدٌ مُسْرِعًا».
Tamyīz resolves an unclear quantity or relation: «عِنْدِي عِشْرُونَ دِرْهَمًا».
In «طَابَ زَيْدٌ نَفْسًا», nafsan is not ḥāl; it clarifies the respect in which the statement holds.
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Ḥāl vs Tamyīz
At-Tamyīz: Clarifying Quantities and Sentence Relations
Ḥāl describes a condition during an event: «جَاءَ زَيْدٌ مُسْرِعًا».
Tamyīz resolves an unclear quantity or relation: «عِنْدِي عِشْرُونَ دِرْهَمًا».
In «طَابَ زَيْدٌ نَفْسًا», nafsan is not ḥāl; it clarifies the respect in which the statement holds.