سَارَ زَيْدٌ وَخَالِدٌ: Khālid is nominative and shares the predicate with Zayd; this is coordination.
سِرْتُ وَالنَّهْرَ: the river does not walk; the wāw expresses accompaniment, and an-nahra is an accusative mafʿūl maʿahu.
Decide by meaning and syntax, not merely by spotting wāw. This contrast is an added teaching example, not a new quotation from the text.
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Coordination (ʿAṭf bi-l-Ḥurūf): Rules and Parsing
سَارَ زَيْدٌ وَخَالِدٌ: Khālid is nominative and shares the predicate with Zayd; this is coordination.
سِرْتُ وَالنَّهْرَ: the river does not walk; the wāw expresses accompaniment, and an-nahra is an accusative mafʿūl maʿahu.
Decide by meaning and syntax, not merely by spotting wāw. This contrast is an added teaching example, not a new quotation from the text.