وَكَذَّبُوا۟ بِـَٔايَـٰتِنَا كِذَّابًا
Sentence structure
وَ adds another cause of punishment. كَذَّبُوا۟ is the verb, with its attached “و” (wāw al-jamāʿah) functioning as the subject; بِـَٔايَـٰتِنَا is linked to it, and كِذَّابًا is a cognate accusative intensifying their denial.
وَكَذَّبُوا۟ — and they denied
Grammar: وَ is a conjunction. كَذَّبُوا۟ is a form II, third-person masculine plural perfect verb. Its final “و” is wāw al-jamāʿah: an attached subject pronoun. The written “ا” after it is alif al-fāriqah and is not pronounced.
بِـَٔايَـٰتِنَا — Our signs
Grammar: بِـ is a preposition. ءَايَـٰتِ is a sound feminine plural made genitive by kasrah and is مضاف; نَا is a possessive pronoun in the genitive position.
كِذَّابًۭا — an emphatic denial
Grammar: An indefinite accusative intensive verbal noun functioning as مفعول مطلق for كَذَّبُوا۟.