Welcome to Katachi
A few quick choices and you're practicing.
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Katachi ✦ 形
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REPS ➔ REFLEX
Master conjugations.
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Start with a short set. Katachi adapts as you practice.
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Conjugation guide
Learn the rule for every form and word class.
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Katachi — Conjugation Lab
You've probably learned the rules already. The hard part is seeing 行く and getting to 行って without stopping to think. Katachi drills just that: one prompt after another, and the ones you miss come back until the answer shows up on its own.