LessonsAl-Majrūrāt — Semantic and Formal IḍāfahQuiz

أَوْ تَقْدِيرًا، نَحْوُ: «غُلَامُ زَيْدٍ»؛ تَقْدِيرُهُ: «غُلَامٌ لِزَيْدٍ».
Translation: Or the prepositional relationship is understood, as in “Zayd’s servant”; its sense is “a servant belonging to Zayd.”

غُلَامُ is the mudāf; its own case depends on its role in the sentence.
زَيْدٍ is the mudāf ilayh, genitive in the construction.

The imagined lām explains the relationship; it is not an overt preposition inserted into the actual construct phrase.

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Genitive through Construct

Al-Majrūrāt — Semantic and Formal Iḍāfah

أَوْ تَقْدِيرًا، نَحْوُ: «غُلَامُ زَيْدٍ»؛ تَقْدِيرُهُ: «غُلَامٌ لِزَيْدٍ».
Translation: Or the prepositional relationship is understood, as in “Zayd’s servant”; its sense is “a servant belonging to Zayd.”

غُلَامُ is the mudāf; its own case depends on its role in the sentence.
زَيْدٍ is the mudāf ilayh, genitive in the construction.

The imagined lām explains the relationship; it is not an overt preposition inserted into the actual construct phrase.