Haal may be a single non-sentence expression or a complete sentence.
Single expression
جَاءَ الْوَلَدُ ضَاحِكًا
The one-word haal is ضَاحِكًا.
Sentence as haal
لَئِنْ أَكَلَهُ الذِّئْبُ وَنَحْنُ عُصْبَةٌ
The nominal sentence وَنَحْنُ عُصْبَةٌ describes the speakers' condition.
Here the technical term مُفْرَد means 'not a sentence'; it does not merely mean one person.
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Haal may be a single non-sentence expression or a complete sentence.
Single expression
جَاءَ الْوَلَدُ ضَاحِكًا
The one-word haal is ضَاحِكًا.
Sentence as haal
لَئِنْ أَكَلَهُ الذِّئْبُ وَنَحْنُ عُصْبَةٌ
The nominal sentence وَنَحْنُ عُصْبَةٌ describes the speakers' condition.
Here the technical term مُفْرَد means 'not a sentence'; it does not merely mean one person.