DeviceDiagnostic question
Explanatory resumptionDoes clause two answer a question raised by clause one?
Protective qualificationDoes added wording prevent a specific misunderstanding?
Useful completionDoes the addition contribute relevant detail?
Generalizing epilogueDoes the second sentence generalize and reinforce the first?
ParenthesisIs a separate explanation inserted into the main utterance?
An expression can exhibit more than one rhetorical feature. Prefer an analysis by checking syntax first, then the hearer's possible question or misconception, and finally the effect the speaker seeks. Memorizing labels without these tests is insufficient.