1. إِنَّ زَيْدٌ قَائِمٌ: wrong; the ism must be «زَيْدًا».
2. إِنَّ زَيْدًا قَائِمًا: wrong; the khabar must be «قَائِمٌ».
3. In «إِنَّ فِي الدَّارِ زَيْدًا», Zayd is the delayed ism inna, not a direct object.
4. In «إِنَّ زَيْدًا أَبُوهُ قَائِمٌ», the entire inner nominal clause—not only «أَبُوهُ»—is the khabar.
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Four Frequent Mistakes
The Predicate of Inna and Its Sisters
1. إِنَّ زَيْدٌ قَائِمٌ: wrong; the ism must be «زَيْدًا».
2. إِنَّ زَيْدًا قَائِمًا: wrong; the khabar must be «قَائِمٌ».
3. In «إِنَّ فِي الدَّارِ زَيْدًا», Zayd is the delayed ism inna, not a direct object.
4. In «إِنَّ زَيْدًا أَبُوهُ قَائِمٌ», the entire inner nominal clause—not only «أَبُوهُ»—is the khabar.