Study

First three groups

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    write, wroten, written
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    buy, bought, bought
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    know, knew, known
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    dream, dreamt, dreamt
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    eat, ate, eaten
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    win,won, won
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    sing, sang, sung
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    fly, flew, flown
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    swim, swam, swum
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    stand, stood, stood
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    teach, taught, taught
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    build, built, built
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    steal, stole, stolen
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    drink,drank, drunk
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    fight, fought, fought
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    catch, caught, caught
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    sit, sat, sat
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    sleep, slept, slept
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    ride, rode, ridden
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    freeze, froze, frozen
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    grow, grew, grown
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    read, read, read
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    think, thought, thought
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    fall, fell, fallen
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    run, ran, run
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    blow, blue, blown
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    hide, hid, hidden