How can wāw precede wa-antum taʿlamūna when the phrase contains an affirmative imperfect? Because the whole circumstance is nominal: the subject is antum and the verbal predicate is taʿlamūna. Wāw introduces the nominal sentence, not a bare affirmative imperfect verbal ḥāl.
Compare جَاءَ زَيْدٌ يَضْحَكُ, in which the qualifying clause is directly verbal. Classifying both cases alike simply because each includes an imperfect would confuse the internal predicate with the overall clause type.
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Wāw with Nominal Circumstantial Clauses: Omission, Inclusion and Disputed Cases
How can wāw precede wa-antum taʿlamūna when the phrase contains an affirmative imperfect? Because the whole circumstance is nominal: the subject is antum and the verbal predicate is taʿlamūna. Wāw introduces the nominal sentence, not a bare affirmative imperfect verbal ḥāl.
Compare جَاءَ زَيْدٌ يَضْحَكُ, in which the qualifying clause is directly verbal. Classifying both cases alike simply because each includes an imperfect would confuse the internal predicate with the overall clause type.