ابواب ثلاثي مجرد- “three-lettered verb forms”

Definition: The base verb (in other words, non-increased form) of the three-lettered verb has 6 different possible forms. These 6 possibilities are derived from the changes in 1. the marker (harakah) on the middle letter in the madi-form; 2. the harakah on the middle letter in the mudari’-form.