«مَا مَرَرْتُ إِلَّا بِزَيْدٍ»
mā: negator.
marartu: past verb plus subject suffix.
illā: restrictor.
bi-: preposition.
Zaydin: genitive noun governed by bi-.
The preposition determines the case, not illā.
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Mufarragh: Genitive after a Preposition
Al-Mustathnā: Connected and Disconnected Exceptions, Four Case Rules
«مَا مَرَرْتُ إِلَّا بِزَيْدٍ»
mā: negator.
marartu: past verb plus subject suffix.
illā: restrictor.
bi-: preposition.
Zaydin: genitive noun governed by bi-.
The preposition determines the case, not illā.