وَقَفْتُ فَوْقَ الْجِسْرِ
Translation: I stood above the bridge.
وَقَفْتُ: past verb, first-person subject.
فَوْقَ: accusative place adverbial, first term of iḍāfa.
الْجِسْرِ: genitive second term.
Added example: fawqa is accusative, while al-jisri is genitive.