The source demonstrates passive formation with regular three-root-letter and derived past forms. The relevant stem vowels change while the underlying morphological structure remains recognizable.
Word / formMeaning / explanation
ضَرَبَ → ضُرِبَstruck → was struck.
سَمِعَ → سُمِعَheard → was heard.
أَكْرَمَ → أُكْرِمَhonored → was honored.
اِجْتَنَبَ → اُجْتُنِبَavoided → was avoided.
In the last example, the derived stem includes additional letters. Adding a ḍammah only to the first letter is insufficient: the internal vowels must also change to produce the correct passive form.