رَأَيْتُ إِبْرَاهِيمَ — I saw Ibrāhīm.
رَأَيْتُ: past-tense verb; تُ is the attached subject pronoun.
إِبْرَاهِيمَ: direct object, accusative, bearing a visible fatḥa without tanwīn.
The fatḥa here marks the accusative. Its function in the next example is different.
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Diptote Causes — Foreign Origin and Its Conditions
رَأَيْتُ إِبْرَاهِيمَ — I saw Ibrāhīm.
رَأَيْتُ: past-tense verb; تُ is the attached subject pronoun.
إِبْرَاهِيمَ: direct object, accusative, bearing a visible fatḥa without tanwīn.
The fatḥa here marks the accusative. Its function in the next example is different.