一般过去时变化规则
(1) 一般在动词后加-ed。
如：play—played, offer—offered, weigh—weighed,
Destroy— destroyed, sign—signed.
(2) 在以字母e结尾的动词后，只加-d。
如：like—liked, provide—provided, hate — hated, date—dated。
(3) 在以“辅音字母+y”结尾的动词后，则改y为i，再加ed。
如：supply—supplied, fly—flied, study— studied.
(4) 在以单短元音的重读闭音节结尾且末尾只有一个辅音字母的动词后，双写最后一个辅音字母，再加-ed。
如：plan—planned, refer—referred, regret—regretted, ban—banned.
★重读闭音节三要素：（1）一个元音字母后跟一个或几个辅音字母
（2）以一个辅音音素结尾；
（3）元音字母发短元音。
★长元音：[i:][ə:][a:][ɔ:][u:]
短元音：[e] [i] [ʌ] [æ][ə][ɔ][u]
常用不规则动词分类表
⒈ A---A---A型（现在式、过去式、过去分词同形）
cost cost cost 花费    cut cut cut 割，切    hit hit hit 打
let let let 让        put put put 放下      read read read 读
hurt hurt hurt 伤
⒉ A---A---B型（现在式和过去式同形）
beat beat beaten 打
⒊ A---B---A型（现在式和过去分词同形）
come came come 来                become became become 变
run ran run 跑
weigh的过去式⒋ A ---B ---B型
⑴在动词原形后加一个辅音字母d或t构成过去式或过去分词。
burn burnt burnt 燃烧  learn learned/learnt learned/learnt 学习mean meant meant 意思  hear heard heard 听见
⑵把动词原形的最后一个辅音字母“d”改为“t”构成过去式或过去分词。
build built built 建筑          lend lent lent 借给
lose lost lost 失去    send sent sent 送    spend spent spent 花费⑶其他
pay paid paid 付      lay laid laid 下蛋      say said said 说bring brought brought 带来        buy bought bought 买
think thought thought 想          catch caught caught 抓住
teach taught taught 教            fight fought fought 战斗
sleep slept slept 睡              keep kept kept 保持
sweep swept swept 扫              stand stood stood 站
understand understood understood 明白      win won won 得胜
shine shone/shined shone/shined 发光      feel felt felt 觉得
find found found 发现                      get got got 得到
hang hanged/ hung hanged/ hung 绞死，挂    have had had 有
hold held held 盛，握                leave left left 离开
make made made 制造                  meet met met 遇见
sell sold sold 卖                    shoot shot shot 射击
tell told told 告诉                  sit sat sat 坐
smell smelt/smelled smelt/smelled 嗅，闻    dig dug dug 挖
⒌ A---B---C型（现在式、过去式和过去分词都不相同）
⑴在动词原形后加-n或-en构成过去分词。
eat ate eaten 吃                  fall fell fallen 落下
steal stole stolen 偷            give gave given 给
freeze froze frozen 冻结          take took taken 拿
see saw seen 看见                write wrote written 写
ride rode ridden 骑              drive drove driven 驾驶
throw threw thrown 抛，扔        blow blew blown 吹
grow grew grown 生长              know knew known 知道
fly flew flown 飞                draw drew drawn 拉，绘画
show showed shown 展示
⑵过去式加-n或-en构成过去分词。
speak spoke spoken 说话          break broke broken 破碎，折断wake waked/ woke waked/ waken 醒      choose chose chosen 选择
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