English words are built from smaller pieces called prefixes and suffixes — like "un-" at the front of "unhappy". Spotting them helps you guess the meaning of new words.
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The first time you see a prefix or suffix, it's a free look: we show you the answer and what it means. No score, no pressure.
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After that, it shows up as a real multiple-choice question mixed in with your regular vocabulary.
📚 Word-Part Library
📘 英語の勉強
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Root Detective
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🕵️ Root Detective
See an English word, spot the prefix or suffix that builds it. New word-parts are taught free the first time you see them — a few at a time.