🔀 Builders: The Error Hospital

A fully interactive B1.1 grammar-skills lesson for teens that runs the Pivot module's error clinic. Learners warm up with four diagnostic questions, then build a doctor's toolkit in three blocks: The Two Time Zones (finished time takes the past simple, life time takes the present perfect, with formula chips, examples and a signal-word panel), The 3-Step Diagnosis (find the signal, name the zone, match the tense), and Common Diseases & Cures (a before-and-after table of five classic pivot errors). Ten clinic words (diagnose, symptom, cure, treat, error, correct, signal, rule, finished, explain) appear in a scrollable glossary with full B1 definitions and examples, and six become review flashcards. The reading is a 170-word hospital story in which the Builders' Studio cast heal sick sentences, with seven hover-tooltip words and the pivot in natural context. Practice offers 8 error-repair fill-in items (went, ever, never, yet, seen, fixed, made, done) with live green/red validation, hints and a running score; a speaking section with five doctor's-round prompts and a six-line model dialogue; a guided 40-70 word patient-file writing task with a four-point checklist and a live word counter with auto-save; and a full 8-question multiple-choice quiz with a progress bar, per-question explanations, a conic-gradient result circle with tiered feedback, and localStorage persistence.