عَادَ الْمُسَافِرُ لَا يَشْكُو أَلَمًا.
The traveler returned without complaining of any pain.
Negation changes the classification and treatment of an imperfect circumstantial clause. The discussion of negative imperfect clauses therefore differs from the simple rule for an affirmative imperfect. Their shared tense form does not by itself make their rules identical.
If the second clause is an independent report rather than a concurrent circumstance, the issue becomes coordination of judgments instead. The analyst must determine negation, circumstantial function, and the kind of wāw before applying a textbook rule.