«نِعْمَ الرَّجُلُ زَيْدٌ»
How excellent a man Zayd is!
After “excellent is the man,” the listener may ask who is meant. In one grammatical analysis, “Zayd” is a predicate whose subject “he” is omitted; the underlying response is huwa Zaydun. It is one recognized analysis of the designated object of praise, not the only permissible parsing.