...单数第三人称形式 play do go study be have like clean答:过去式:加ed 现在分词:加ing 单三:加s play,played,playing,plays do,did,doing,does go,went,going,goes study,studied,studying,studies be,was/were,being,is have,had,having,has like,liked,liking,likes clean,cleaned,cleaning,cleans ...