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结构1.肯定形式① be动词was / were …

② 行为动词动词的过去式(动词过去式分规则变化与不规则变化)如 He was a teacher 3 years ago.

Jenny visited Shanghai last month. I went to school at 6:30 yesterday.

规则动词的过去式的构成遵循以下四个规则∶

a.直接在动词后加ed，例如help-helpedwant-wanted等

b.以不发音的字母e结尾时，去掉e加ed(即直接加d)，例如like-liked;use-used等

c. 以辅音字母y结尾时，把y变成i再加ed，例如carry-carried; study-studied等;

d.以重读闭音节结尾，双写最后一个辅音字母再加ed，例如∶stop-stopped;shop-shopped等。不规则动词的过去式则需要特殊记，例如go-wentcome-came;buy-bought等。