原形 过去式 原形 过去式 原形 过去式 原形 过去式 sweep swept teach taught have had go went keep kept think thought do did find found sleep slept buy bought eat ate say said feel felt drink drank is/am was take took read read give gave are were mean meant put put sing sang drive drove meet met cut cut begin began speak spoke make made let let ring rang write wrote see saw fly flew run ran ride rode come came draw drew sit sat hear heard tell told grow grew learn learned/ learnt get got know knew