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1、动词过去式形式变化规律如下：规则动词的过去式变化如下：
（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
2、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，put-put，grow-grew，take-took，catch-caught，come-came，become-became，swim-swam，sweep—swept，sing—sang，draw—drew.
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