وَإِذَا ٱلْجِبَالُ سُيِّرَتْ
Sentence structure
Another coordinated إِذَا condition follows the same pattern: ٱلْجِبَالُ is nominative and سُيِّرَتْ is the explanatory passive clause.
Ayah summary
The mighty mountains will be uprooted and set in motion.
وَإِذَا — And when
Grammar: وَ coordinates the whole conditional construction with the preceding one. إِذَا is a future non-jussive temporal adverb containing conditional meaning.
ٱلْجِبَالُ — the mountains
Grammar: The noun is nominative; here it is the deputy subject of an omitted passive verb explained by سُيِّرَتْ.
سُيِّرَتْ — are moved away
Grammar: A Form II feminine singular perfect passive verb. The written verbal clause is explanatory and has no syntactic position.