（1）一般情况下，动词词尾加 ed ，如：worked played wanted acted
（2）以不发音的 e 结尾动词，动词词尾加 d，如：lived moved decided declined hoped judged raised wiped
（3）以辅音字母 + y结尾的动词，把y变为i 再加ed，如：studied tried copied justified cried carried embodied emptied
（4）以一个辅音字母结尾的重读闭音节动词，双写词尾辅音字母，再加 ed，如： stopped begged fretted dragged dropped planned dotted dripped
（5）注：不规则动词的过去式变化规律性不强，须多加记忆。go - went，make - made，get - got ，buy - bought ，come - came ，fly-flew ，is/am-was，are-were ，see-saw ，bring-brought，do-did，teach-taught, think-thought, say-said,sit-sat. read-read, spend-spent, eat-ate,give-gave,sit-sat,tell-told,write-wrote,feel-felt,find-found,hear-heard,know-knew, put-put,grow-grew,take-took,catch-caught,come-came,become-became,swim-swam，sweep—swept，sing—sang，draw—drew，
