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sing-singing-sang
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speak-speaking-spoke
sweep-sweeping-swept
swim-swimming-swam
take-taking-took
teach-teaching-taught
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think-thinking-thought
throw-throwing-threw
wake-waking-woke
wear-wearing-wore
win-winning-won
write-writing-wrote
leave-leaving-left
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can-could
worry-worrying-worried
try-trying-tried
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watch-watching-watch
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play-playing-played
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like-liked
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help-helping-helped
travelt-traveling-traveled
study-studying-studied
ski-skiing-skied