وَمَآ أَدْرَىٰكَ مَا هِيَهْ ١٠
Sentence structure
وَ resumes. First interrogative مَآ is followed by Form IV أَدْرَىٰكَ with object كَ. The second مَا introduces the object-question, and هِيَهْ is its predicate expression with pause هْ.
Ayah summary
This question emphasizes the dreadful reality of that abyss.
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.
هِيَهْ — it is
Grammar: A feminine-singular detached pronoun functioning as predicate expression; final هْ is the pause hāʾ.