رَأَيْتُ عُمَرَ
Translation: I saw ʿUmar.
رَأَيْتُ: past-tense verb built on sukūn because the subject tāʾ is attached; «تُ» is an attached subject pronoun in the nominative position.
عُمَرَ: accusative direct object with visible fatḥa and no tanwīn.
Here fatḥa marks accusative. In «مَرَرْتُ بِعُمَرَ» the same visible fatḥa serves as the genitive marker instead.
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Causes of Diptote Status — ʿAdl and Waṣf
رَأَيْتُ عُمَرَ
Translation: I saw ʿUmar.
رَأَيْتُ: past-tense verb built on sukūn because the subject tāʾ is attached; «تُ» is an attached subject pronoun in the nominative position.
عُمَرَ: accusative direct object with visible fatḥa and no tanwīn.
Here fatḥa marks accusative. In «مَرَرْتُ بِعُمَرَ» the same visible fatḥa serves as the genitive marker instead.