زَيْدٌ ضَرَبْتُهُ
Zayd—I struck him.
«Zayd» is the outer subject; «ḍarabtu» contains a verb and its first-person subject, while «-hu» is an object pronoun referring back to Zayd. The entire verbal clause functions as the predicate.
The connecting pronoun is here the object, not the doer. This is important because a clause can be grammatically linked to its subject in several ways; the strongest analysis of taqawwī in «Zayd qāma» hinges on a narrower arrangement.