The beginning of the verb stays familiar, but the ending changes to show who did the action.
What changed?MeaningArabic form
base formhe didفَعَلَ
ا addedthey two men didفَعَلَا
تُ addedI didفَعَلْتُ
نَا addedwe didفَعَلْنَا
So, do not look at the whole form as a new word. First notice the ending.
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Conjugating the Active Positive Past Tense (Maadhi Ma'roof)
The beginning of the verb stays familiar, but the ending changes to show who did the action.
What changed?MeaningArabic form
base formhe didفَعَلَ
ا addedthey two men didفَعَلَا
تُ addedI didفَعَلْتُ
نَا addedwe didفَعَلْنَا
So, do not look at the whole form as a new word. First notice the ending.