جِئْتُ أَنَا وَزَيْدٌ contains explicit emphasis, allowing nominative coordination.
جِئْتُ وَزَيْدًا does not; the text prescribes accusative accompaniment.
The crucial condition is whether coordination is admitted, not merely whether the verb is pronounced.
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Al-Mafʿūl Maʿahu: Accompaniment and Coordination
جِئْتُ أَنَا وَزَيْدٌ contains explicit emphasis, allowing nominative coordination.
جِئْتُ وَزَيْدًا does not; the text prescribes accusative accompaniment.
The crucial condition is whether coordination is admitted, not merely whether the verb is pronounced.