اِخْتَارَ means “to select or choose” and derives from خ ي ر. After the infixed tāʾ of Form VIII, the original yāʾ becomes long ā in the perfect; ī is visible in the verbal noun.
CategoryForm
Active perfectاِخْتَارَ
Active imperfectيَخْتَارُ
Verbal nounاِخْتِيَارٌ
Active participleمُخْتَارٌ
Passive perfectاُخْتِيرَ
Passive imperfectيُخْتَارُ
Passive participleمُخْتَارٌ
Imperativeاِخْتَرْ
Prohibitionلَا تَخْتَرْ
اِخْتَرْ contracts the medial long vowel while the additional tāʾ remains.