عَلِمْتُ أَزَيْدٌ حَاضِرٌ؟
Translation: I learned whether Zayd was present.
The interrogative clause about Zayd remains internally nominative and is embedded as the content of the cognition verb.
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A Simpler Interrogative Example
Verbs of the Heart: Two Objects, Cancellation and Suspension
عَلِمْتُ أَزَيْدٌ حَاضِرٌ؟
Translation: I learned whether Zayd was present.
The interrogative clause about Zayd remains internally nominative and is embedded as the content of the cognition verb.