ضَرَبَ — يَضْرِبُ
He struck — he strikes.
Root: ض ر ب. The imperfect يَ is not part of the root. Replace it with مِ, retain the sukūn on ḍād, give rāʾ fatḥah and mark the nominal ending with tanwīn.
يَضْرِبُ ← مِضْرَبٌ
This names an object used to strike. It does not itself mean the event of striking; the instrument meaning is supplied by the derived nominal pattern.
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From yaḍribu to miḍrab
Ism al-Ālah: Definition, Three Patterns, Paradigms and Formation
ضَرَبَ — يَضْرِبُ
He struck — he strikes.
Root: ض ر ب. The imperfect يَ is not part of the root. Replace it with مِ, retain the sukūn on ḍād, give rāʾ fatḥah and mark the nominal ending with tanwīn.
يَضْرِبُ ← مِضْرَبٌ
This names an object used to strike. It does not itself mean the event of striking; the instrument meaning is supplied by the derived nominal pattern.