写出下列动词的过去式和过去分词 shake-shoke-shakenlet-let-letname-named-namedstand-stood-stoodtell-told-toldtake-took-takenwalk-walked-walkedsell-sold-soldbegin-began-begunlearn-learned/learnr-learned/learntneed-needed-neededproject-projected-projectedstop-stopped-stoppedgrow-grew-growndecide-decided-decidedkill-killed-killedbecome-became-becomesave-saved-savedplan-planned-plannedplant-planted-plantedstart-started-startedfeed-fed-fed
walk的过去式，第三人称单数形式，现在分词 第三人称单数：walks过去分词：walked复数：walks现在进行时：walking过去式：walked
walk的现在分词和过去式是什么 walking walked
