أَيَحْسَبُ أَن لَّمْ يَرَهُۥٓ أَحَدٌ
Sentence structure
أَ asks and يَحْسَبُ has understood subject. The clause after أَن is its object: لَّمْ makes يَرَ jussive, attached هُۥٓ is the object, and أَحَدٌ the subject.
Ayah summary
Does he think that no one has seen him?
أَيَحْسَبُ — Does he think
Grammar: أَ is interrogative; يَحْسَبُ is a third-person masculine-singular indicative imperfect with understood subject.
أَن — that
Grammar: A subordinating/source particle introducing the clause that functions as the object of يَحْسَبُ.
لَّمْ — not
Grammar: A particle of negation and jussive governing the following imperfect.
يَرَهُۥٓ — sees him
Grammar: A third-person masculine-singular jussive imperfect after لَّمْ; attached هُۥٓ is the object and final yā is omitted for jussive.
أَحَدٌ — anyone
Grammar: An indefinite masculine-singular nominative subject of يَرَ.