In arā qabra naḥḥām ... ka-qabri ghawiyy, the verb of perception introduces the graves and the comparative phrase completes the contrast. In arā al-ʿaysha kanzan, the verb is used in the sense of judging or regarding: al-ʿaysh is its first object and kanzan the second.
Inna al-mawta ... la-ka-l-ṭawl combines inna with an emphatic lām, while ka- introduces comparison and takes a genitive. Grammar mirrors the thought: visible graves are compared, a judgment about life follows, and the certain grasp of death is finally affirmed.