وَمَآ أَدْرَىٰكَ مَا ٱلْقَارِعَةُ ٣
Sentence structure
وَ resumes. First interrogative مَآ is followed by Form IV أَدْرَىٰكَ, whose attached كَ is object. The second مَا introduces the object-question مَا ٱلْقَارِعَةُ.
Ayah summary
The full horror of that event is beyond human estimation.
وَمَآ — And what
Grammar: وَ resumes and مَآ is interrogative.
أَدْرَىٰكَ — could make you know
Grammar: A Form IV third-person masculine-singular perfect whose subject is the hidden pronoun «هُوَ»; attached كَ is its object.
مَا — what
Grammar: An interrogative noun introducing the object-question of أَدْرَىٰ.
ٱلْقَارِعَةُ — the Striking Calamity
Grammar: A defined feminine nominative noun completing the interrogative expression.