2023年初中数学一般过去时定义用法
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一般过去时 一、定义 一般过去时是表示过去经常或偶然发生的动作或存在的状态。 二、用法 ① 在确定的过去时间里所发生的动作或存在的状态。 时间状语有∶just now;yesterday; last week; an hour ago; the other day; in 1982 等。Where did you go just now?She wasn't at home last night. ② 表示在过去一段时间内，经常性或习惯性的动作。 When I was a child, I often played football in the street. Whenever the Browns went during their visit, they were given a warm welcome. 三、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。 (责任编辑：admin) |