حَسَنٌ وَجْهُهُ — حَسَنٌ وَجْهَهُ
In ḥasanun wajhuhu the dependent is nominative subject; in ḥasanun wajhahu it is accusative with an object-like analysis. The suffix -hu stays genitive in both.
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Case Change, Role Change
Ṣifah Mushabbahah: Stable Qualities, Government and 18 Patterns
حَسَنٌ وَجْهُهُ — حَسَنٌ وَجْهَهُ
In ḥasanun wajhuhu the dependent is nominative subject; in ḥasanun wajhahu it is accusative with an object-like analysis. The suffix -hu stays genitive in both.