يَكْتُبُ — يُكْرِمُ — يَتَعَلَّمُ — يُدَحْرِجُ
The imperfect prefix is open except for verbs whose past form has four letters, where it carries ḍamma.
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Immediate Prefix-Vowel Comparison
The Imperfect Verb: Recognition, Time, Prefixes and Mood
يَكْتُبُ — يُكْرِمُ — يَتَعَلَّمُ — يُدَحْرِجُ
The imperfect prefix is open except for verbs whose past form has four letters, where it carries ḍamma.