If wāw appears before an affirmative imperfect, which method is strongest?

Supplementary Practice 7: Editing Expressions, Weighing Context and Rhetorical Critique

• Call it circumstantial wāw in every case
• Declare the expression inherently invalid in every use
• Investigate coordination or another construction rather than instantly labeling wāw circumstantial
• Automatically convert the imperfect to a noun