The lightened form kaʾan may be inoperative; then Zaydun is nominative subject. The stressed form governs accusative Zaydan.
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Lightened Kaʾanna
Inna and Its Sisters: Six Particles, Meanings, Government and Exceptions
The lightened form kaʾan may be inoperative; then Zaydun is nominative subject. The stressed form governs accusative Zaydan.