يُعْجِبُنِي صِدْقُكَ وَأَنْ تَفِيَ بِوَعْدِكَ.
Your truthfulness and keeping your promise please me. Ṣidquka is the subject; an tafiya is a coordinated verbal noun, with tafiya subjunctive by visible fatḥa.
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Full Parsing: Coordination to a Noun
The Subjunctive Imperfect and Its Governors
يُعْجِبُنِي صِدْقُكَ وَأَنْ تَفِيَ بِوَعْدِكَ.
Your truthfulness and keeping your promise please me. Ṣidquka is the subject; an tafiya is a coordinated verbal noun, with tafiya subjunctive by visible fatḥa.