题目内容：

do,have.go.see.play.study.clean.stop第三人称单数,现在分词和过去式

优质解答

do-does-doing-did
have-has-having-had
go-goes-going-went
see-sees-seeing-saw
play-plays-playing-played
study-studies-studying-studied
clean-cleans-cleaning-cleaned
stop-stops-stopping-stopped 这就是了