1、動詞過去式形式變化規律如下：規則動詞的過去式變化如下：

（1）一般情況下，動詞詞尾加 ed ，如：worked played wanted acted。

（2）以不發音的 e 結尾動詞，動詞詞尾加 d，如：lived moved decided declined hoped judged raised wiped。

（3）以輔音字母 + y結尾的動詞，把y變為i 再加ed，如：studied tried copied justified cried carried embodied emptied。

（4）以一個輔音字母結尾的重讀閉音節動詞，雙寫詞尾輔音字母，再加 ed，如：stopped begged fretted dragged dropped planned dotted dripped

2、不規則動詞的過去式變化規律性不強，須多加記憶：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.