كَلَّا سَوْفَ تَعْلَمُونَ ٣
Sentence structure
كَلَّا is a deterrent particle. سَوْفَ marks the future, and تَعْلَمُونَ is a second-person masculine-plural imperfect whose plural ending supplies the subject.
Ayah summary
Never so; you will soon know the outcome of your mistaken way.
كَلَّا — No indeed
Grammar: A deterrent particle that rejects and warns.
سَوْفَ — soon will
Grammar: A future particle governing the time reference of the following imperfect.
تَعْلَمُونَ — you will know
Grammar: A second-person masculine-plural imperfect; واو الجماعة is the subject, final نَ marks the indicative form of the five verbs, and its object is omitted without specifying an unstated wording.