مَرَرْتُ بِكَ وَبِزَيْدٍ
Translation: I passed by you and by Zayd.
Marartu: past verb with attached subject -tu.
Bi-: preposition; -ka: built attached pronoun in the genitive slot.
Wāw: coordinating particle.
Bi-: repeated preposition.
Zaydin: noun made genitive by the repeated bi-, with visible kasra.
The pronoun has a genitive grammatical position; Zayd shows its genitive ending overtly.