外研版英语《Unit1 Did you fall off your bike》ppt课件
外研版英语《Unit1 Did you fall off your bike》ppt课件第3页

动词过去式的不规则变化: 原型 过去式 原型 过去式 am/is was sing sang are were drink drank isn't wasn't have had aren't weren't go went do did see saw don't didn't eat ate take took come came travel travelled fall fell