feel的变化和以下单词差不多： sleep(slept) keep(kept) sweep(swept) fall的变化（改动一个字母）和下面的单词差不多： sit sat babysit babysat come came become became draw drew drink drank drive drove get got forget forgot give gave grow grew know knew make made ride rode ring rang run ran send sent sing sang spend spent swim swam win won write wrote 常用的就这些,主要的就是背
