"我昨天去了公园"——英语里这句到底是 go 还是 went？孩子一到过去时就乱。
判断办法其实很土：先找时间词。
一眼认出过去时
句子里只要出现 yesterday、last week、last year、…ago（多久以前）、just now，那就是过去时没跑。
- I watched TV yesterday.
- She went to Beijing last summer.
规则动词：加 ed
大部分动词老老实实加 ed：
- watch → watched
- play → played
- 以 e 结尾只加 d：live → lived
- 辅音+y 结尾，y 变 i 加 ed：study → studied
- 重读闭音节双写尾字母：stop → stopped
不规则动词：只能背
偏偏最常用的那几个全是不规则的：
- go → went
- have → had
- see → saw
- eat → ate
- is/am → was，are → were
疑问和否定
过去时一律请 did 出马，动词回原形：
- Did you watch TV?（不是 Did you watched）
- I didn't go out.
小提醒：did 一出现，后面的动词立刻变回原形，这是改错题最爱考的点。
