did是do的过去式，表示过去做了某事I did it yesterdaywas是is/am的过去式，I或者第三人称单数过去怎么样I/He was a student last yearwere是are的过去式，You或者复数人称过去怎么样You were a baby 10 years ago
八zhuangma
得得得得得兔兔离开啦咯啦咯了
