أَعْجَبَنِي حُضُورُكَ وَأَنْ تُسَاعِدَ زُمَلَاءَكَ.
Your attendance and helping your classmates pleased me. This version makes an overt before the subjunctive verb.
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An Can Be Shown in This Coordination
The Subjunctive Imperfect and Its Governors
أَعْجَبَنِي حُضُورُكَ وَأَنْ تُسَاعِدَ زُمَلَاءَكَ.
Your attendance and helping your classmates pleased me. This version makes an overt before the subjunctive verb.