1、定义：表示过去某个时间里发生的动作或存在的状态。常和表示过去的时间状语连用，如：a moment ago，just now，yesterday，last week，this morning等。
如：My brother often went to school by bike last term.
The watch was beside the diary a moment ago.
I watched the moon and ate the moon cakes last Mid-Autumn Festival.
Jim went to the supermarket yesterday.
2、构成：主语+动词的过去式+其他
3、动词过去式的变化规则：
① 一般在动词原形末尾加ed
如：play-played，listen-listened，look-looked
② 结尾是e的动词，加d
如：live-lived，like-liked，taste-tasted
③ 辅音字母+y结尾的动词，变y为i，再加ed
如：study-studied，carry-carried，cry-cried
④ 末尾只有一个辅音字母的重读闭音节词，双写这个辅音字母，再加ed
如：stop-stopped，plan-planned