-
最佳答案：visited visited studied studied planned planned
-
最佳答案：study-studied-studied
-
最佳答案：feel,felt,felt. rise,rose,risen.
-
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
-
最佳答案：cleanedreadwaitedshoppedrainedsnowedcookedstudiedlaindescribed
-
最佳答案：都市直接在其后面加-ed
-
最佳答案：watch ,watched,watchedam was,beencry,cried,criedtravel ,travelled,travelledplan,
-
最佳答案：原形,过去式,过去分词play,played,playedstudy,studied,studiedrain ,rained ,rainedfly ,flew
-
最佳答案：worked,sung,played,studied,dancedhad,written,taken,run,sat,shoppedswum,lain
-
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