بِأَوَائِلِهَا هَاءُ التَّنْبِيهِ، نَحْوُ: «هَذَا وَهَذَانِ وَهَؤُلَاءِ».
Translation: The attention particle hāʾ can be prefixed, as in hādhā, hādhāni, and hāʾulāʾi.
هَا draws attention and is a particle, not itself the case-bearing demonstrative. In «هَذَا», the demonstrative element is «ذَا».
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Demonstratives — forms, syntax and usage
بِأَوَائِلِهَا هَاءُ التَّنْبِيهِ، نَحْوُ: «هَذَا وَهَذَانِ وَهَؤُلَاءِ».
Translation: The attention particle hāʾ can be prefixed, as in hādhā, hādhāni, and hāʾulāʾi.
هَا draws attention and is a particle, not itself the case-bearing demonstrative. In «هَذَا», the demonstrative element is «ذَا».