إِنَّ زَيْدًا يَقْرَأُ
Translation: Indeed, Zayd is reading.
زَيْدًا: accusative ism inna.
يَقْرَأُ: present verb nominative by ḍamma, with a concealed subject «هُوَ» referring to Zayd.
Verb plus its concealed subject form a verbal clause occupying the nominative khabar slot.
Zayd is not the overt grammatical subject of the present verb in this structure.