Past patterns
فَعَلَ، فَعِلَ، فَعُلَ
Imperfect patterns
يَفْعَلُ، يَفْعِلُ، يَفْعُلُ
The difference is the vowel on عین کلمہ, the middle root position. For example, compare the middle vowel in نَصَرَ—يَنْصُرُ.
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The Three Past and Three Imperfect Patterns
The Six Babs of Basic Triliteral Verbs
Past patterns
فَعَلَ، فَعِلَ، فَعُلَ
Imperfect patterns
يَفْعَلُ، يَفْعِلُ، يَفْعُلُ
The difference is the vowel on عین کلمہ, the middle root position. For example, compare the middle vowel in نَصَرَ—يَنْصُرُ.