be过去式be,cook,know,swim,get,teach,leave,feel,smell,drive,run,think,keep,buy,begin,do,cost,find,throw,stand的过去式

问题描述:

be过去式
be,cook,know,swim,get,teach,leave,feel,smell,drive,run,think,keep,buy,begin,do,cost,find,throw,stand的过去式