A-zaydun ḥāḍirun? uses interrogative hamza; a-zaydu aqbil! uses vocative hamza. Parsing depends on construction.
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Interrogative Hamza versus Vocative
Comprehensive Review: Applied Arabic Parsing
A-zaydun ḥāḍirun? uses interrogative hamza; a-zaydu aqbil! uses vocative hamza. Parsing depends on construction.