When wāw expresses accompanying action after the six environments, the following imperfect is subjunctive under understood an. This is wāw of accompaniment, not ordinary coordinating wāw.
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Category 5: Accompanying Wāw
The Subjunctive Imperfect and Its Governors
When wāw expresses accompanying action after the six environments, the following imperfect is subjunctive under understood an. This is wāw of accompaniment, not ordinary coordinating wāw.