الْفَصْلُ وَالْوَصْلُ
The choice between separation and joining.
First determine whether the initial clause has an external syntactic role, then whether the second clause should share it. Coordination expresses the intended common role where the necessary conditions are satisfied.
If there is no such grammatical sharing, assess the semantic connector, discourse purpose and risk of misleading common attribution. Formal possibility and rhetorical appropriateness are separate stages of analysis.
SituationPrimary questionLikely decision
External case position existsSame grammatical role intended?Join if appropriate
No case position, but common linkShared semantic act intended?Join when context supports
False common judgment possibleWould joining misattribute?Separate
No evident semantic linkAny real common purpose?Separate or supply context