«مَرَرْتُ بِأَحْمَدِكُمْ»
Translation: “I passed by your Aḥmad.”
أَحْمَدِ is the first member of an iḍāfah, with كُمْ as an attached genitive pronoun. After بِ, the noun has genitive kasrah rather than the normal diptote genitive fatḥah.
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The text’s iḍāfah example
Restoring Declension: Indefinite Names, Al- and Iḍāfah
«مَرَرْتُ بِأَحْمَدِكُمْ»
Translation: “I passed by your Aḥmad.”
أَحْمَدِ is the first member of an iḍāfah, with كُمْ as an attached genitive pronoun. After بِ, the noun has genitive kasrah rather than the normal diptote genitive fatḥah.