The book specifies two words where the pronoun hāʾ bears sukūn: أَرْجِهْ and فَأَلْقِهْ. Neither should be made into the ordinary kasrah or ḍammah pattern.
Sukūn means no short vowel on that hāʾ. In practice, do not insert an extra “hi” or “hu” at the end.
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Two exceptional sukūn cases
Rules of Hāʾ al-Ḍamīr: Vowels, Ṣilah and Exceptions
The book specifies two words where the pronoun hāʾ bears sukūn: أَرْجِهْ and فَأَلْقِهْ. Neither should be made into the ordinary kasrah or ḍammah pattern.
Sukūn means no short vowel on that hāʾ. In practice, do not insert an extra “hi” or “hu” at the end.