قُتِلَ أَصْحَـٰبُ ٱلْأُخْدُودِ
Sentence structure
قُتِلَ is passive perfect. أَصْحَـٰبُ is its nominative deputy subject and is annexed to ٱلْأُخْدُودِ.
Ayah summary
The people who dug the fiery trenches were cursed and destroyed.
قُتِلَ — Destroyed were
Grammar: A third-person masculine-singular passive perfect.
أَصْحَـٰبُ — (the) companions
Grammar: A nominative masculine-plural deputy subject of قُتِلَ, annexed to ٱلْأُخْدُودِ.
ٱلْأُخْدُودِ — (of) the pit
Grammar: ٱل is the definite article; أُخْدُودِ is the genitive complement of أَصْحَـٰبُ.