بَلِ ٱلَّذِينَ كَفَرُوا۟ يُكَذِّبُونَ
Sentence structure
بَلِ resumes with a contrast. ٱلَّذِينَ is the nominative topic, كَفَرُوا۟ its relative clause, and يُكَذِّبُونَ its verbal predicate.
Ayah summary
Rather, the deniers persist in rejecting the truth.
بَلِ — Nay
Grammar: A non-governing contrastive/resumptive particle; its final kasra avoids two consonants meeting.
ٱلَّذِينَ — Those who
Grammar: A masculine-plural relative pronoun functioning as the nominative topic; كَفَرُوا۟ is its relative clause.
كَفَرُوا۟ — disbelieved
Grammar: A third-person masculine-plural perfect forming the relative clause. Attached و is the subject and the final alif is orthographic.
يُكَذِّبُونَ — deny
Grammar: A Form II third-person masculine-plural imperfect functioning as the predicate. Attached و is the subject and final ن marks the indicative.