CaseReason for separationDiagnostic featureComplete connectionReplacement, clarification, emphasisSecond develops the same meaningComplete disconnectionDifferent type or no suitabilityNo relevant common theme or functionNear-complete connectionAnswers an implicit questionFirst prompts a specific questionNear-complete disconnectionFalse attribution if joinedTwo speakers’ views might be confusedIntermediate caseUnwanted shared grammatical scopeSecond must stand outside quote or condition
The issue is not merely the presence of a pause. The decisive questions are the semantic and syntactic relationship between the clauses, and what wāw would make the listener understand.