فَإِنَّمَا هِىَ زَجْرَةٌ وَٰحِدَةٌ
Ayah summary
Bringing everyone back to life is not difficult for Allah; there will be only one commanding cry.
Sentence structure
فَ resumes the reply. In إِنَّمَا, مَا restrains إِنَّ from governing and creates restriction. Thus هِىَ is the subject, زَجْرَةٌ its predicate, and وَٰحِدَةٌ an adjective.
فَإِنَّمَا — then it is only
Grammar: فَ resumes the statement. إِنَّ joins preventive مَا, producing restriction and no longer assigning accusative case to a noun.
هِىَ — it
Grammar: A third-person feminine singular detached pronoun functioning as the nominative subject.
زَجْرَةٌۭ — a single blast / rebuke
Grammar: An indefinite feminine singular nominative noun and the predicate of هِىَ.
وَٰحِدَةٌۭ — one
Grammar: An indefinite feminine singular nominative adjective describing زَجْرَةٌ.