❓ Every interrogative word, phrase & form in English — 5 W’s, How, yes/no, tag, choice, indirect, polite, negative, rhetorical; advanced relatives whom · whose · which · that; archaic wherein · whereof · whereby · whereupon · whither · whence · wherefore; compound what for · what if · what else · which way · how so · how dare · what sort/kind/type/manner; the -soever suffix; cleft Q ("what is it that…?"); free relatives (whoever · whatever · wherever · whichever · however); echo Q, declarative Q, mini-Q, multiple-wh Q; the world’s question marks (¿ ; ՞ ؟ ？); cross-language interrogatives across French, Spanish, German, Italian, Japanese, Mandarin, Arabic, Russian, Hebrew, Korean, Vietnamese, Thai, Turkish, Hindi, Swahili, Welsh, Hawaiian, ASL, Esperanto & Latin; pedagogy (Socratic, Bloom, funnel, probing), hypothetical & counterfactual, and conversational repair (sluicing, "sorry, what?"). 480 lessons across 40 units.