三个必背细节
① 否定疑问里的原形绝对不能变：didn't buy（✗ didn't bought）、Did you go（✗ Did you went）。
② 辅音+y 才变 i：play→played（元音+y 直接加），不要写成 plaied。
③ -ed 在 t/d 后要多读一拍：wanted 是两个音节，别读成"万提德"一大串。
⑤ 场景全解：购物日记里的过去时（配图记忆）
场景
例句
记忆点
1 去了哪里
We went to the city centre last Saturday.
go→went 不规则，必背
2 买了什么
I bought a new school jacket.
buy→bought，购物主题核心
3 花了多少钱
It cost forty-five pounds.
cost 三态同形 cost-cost-cost
4 怎么付的钱
I paid with my pocket money.
pay→paid（不是 payed）
5 试穿与选择
I tried on both and chose the blue one.
try→tried（y→i）；choose→chose
6 否定与疑问
I didn't take the black one. Did you enjoy it?
didn't/Did 后全是原形
过去时"时间信号灯"（看到就用过去式）
时间词
意思
例句
yesterday
昨天
I saw him yesterday.
last week / last Saturday / last year
上周/上周六/去年
We went there last Saturday.
... ago（two days ago）
……以前
She bought it two days ago.
this morning（已过去的早上）
今天早上
I paid this morning.
in + 过去年份（in 2019）
在……年
They moved here in 2019.
怎么判断该用过去时完形填空先扫时间词：出现 yesterday / last / ago / just now → 动词一律过去式；句子没给时间词，就看上下文是不是在讲"已经发生的事"。KET Part 5 最爱用时间词做"时态开关"。
⑥ 中国学生 5 大高频错误诊断
错误 1：didn't 后面还写过去式 ✗ I didn't went to the market. → ✓ I didn't go to the market. 口诀：did 一出现，动词就穿回原形。
错误 2：疑问句动词还在变形 ✗ Did you bought it? → ✓ Did you buy it? Did 已经是过去式，buy 保持原形。
错误 3：辅音+y 直接加 ed ✗ He tryed on the jacket. → ✓ He tried on the jacket. 辅音+y：y 变 i 再加 -ed（try→tried）。
错误 4：忘记不规则动词，乱加 -ed ✗ I buyed a jacket. → ✓ I bought a jacket. go/buy/pay/choose 这类不规则词必须单独背。
错误 5：时间词和时态对不上 ✗ Yesterday I buy a jacket. → ✓ Yesterday I bought a jacket. 看到 yesterday/last/ago 立刻警觉：动词要变过去式。
⑦ KET 考点与真题演练
题型
怎么考
应对
Reading Part 5 完形
短文挖空，给动词原形填过去式或 didn't+原形
先找时间词，再定肯/否
Reading Part 3 阅读判断
判断 "What did they buy?" 细节对错
抓不规则过去式定位句子
Writing Part 6 便条
35 词：讲昨天买了什么、花了多少
通篇过去式，别一半现在一半过去
Listening Part 3 对话
听购物对话选"谁买了什么/花了多少"
抓 bought/paid/cost 与数字
Speaking Part 2
讲上次周末做了什么
用 went/bought/had 串成小故事
真题风格演练（KET 出题方式）
真题风格 · Part 5完形填空：Last Saturday, my mum and I (1) ___ (go) to the shops. I (2) ___ (not buy) the expensive jacket.
参考：Hi Sam, yesterday I went to the supermarket. I bought some milk and bread. They cost five pounds. I put them in the fridge. Tom（went/bought/cost/put 全过去式）
⑧ 背诵内容：10 个必备句型 + 购物小日记模板
每天背 3 句，3 天背完。背的时候大声读，边读边想意思，别死记单词。
1. I went to the shops yesterday. 我昨天去了商店。
2. My mum and I bought a new jacket. 我和妈妈买了件新外套。
3. It cost twenty-five pounds. 它花了 25 英镑。
4. I paid with my pocket money. 我用零花钱付的钱。
5. I tried on both jackets. 两件外套我都试穿了。
6. The blue one fitted perfectly. 蓝色那件非常合身。
7. I didn't take the black one. 我没要黑色那件。
8.Did you enjoy the trip? 你玩得开心吗？
9. We had a great time. 我们玩得很愉快。
10. On the way home, we saw a lovely café. 回家路上我们看到一家可爱的咖啡馆。
购物小日记模板（KET Writing Part 6 直接套）
Last Saturday, I went to the shopping centre with my mum. I needed a new jacket, so we went into a clothes shop. I tried on two jackets and chose the blue one. It cost twenty-five pounds. I paid at the till. We bought some ice cream on the way home. It was a lovely day!