Sukūn and jazm describe the absence of a short vowel on a letter. A letter with sukūn is read without its own fatḥah, kasrah or ḍammah and connects to the preceding sound.
In اِضْرِبْ, both ضْ and the final بْ carry sukūn.
بَ is not the same as بْ: the first has a short a-vowel, whereas the second is vowel-less. This distinction is basic to accurate morphological reading.
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Sukūn and jazm
Introduction to ʿIlm al-Ṣarf and Basic Terminology
Sukūn and jazm describe the absence of a short vowel on a letter. A letter with sukūn is read without its own fatḥah, kasrah or ḍammah and connects to the preceding sound.
In اِضْرِبْ, both ضْ and the final بْ carry sukūn.
بَ is not the same as بْ: the first has a short a-vowel, whereas the second is vowel-less. This distinction is basic to accurate morphological reading.