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最佳答案:study-studied-studied
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最佳答案:feel,felt,felt. rise,rose,risen.
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最佳答案:复数:studies第三人称单数:studies过去式:studied过去分词:studied现在分词:studying
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最佳答案:cleanedreadwaitedshoppedrainedsnowedcookedstudiedlaindescribed
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最佳答案:都市直接在其后面加-ed
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最佳答案:watch ,watched,watchedam was,beencry,cried,criedtravel ,travelled,travelledplan,
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最佳答案:原形,过去式,过去分词play,played,playedstudy,studied,studiedrain ,rained ,rainedfly ,flew
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最佳答案:worked,sung,played,studied,dancedhad,written,taken,run,sat,shoppedswum,lain
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最佳答案:spend in/on 中的介词in或on是可以省略的.这一句的完整表达形式是:I spent three days being locked in my st