按动作发生的方式，发生过程的长短，可把动词分为延续性动词和非延续性动词。
延续性动词：learn, work, stand, lie, know, walk, keep, have, wait, watch, sing, read, sleep, live, stay等，可与一段时间连用，如：for 2 years, since he came here, since last year.
非延续性动词：open, close, die, begin, start, finish, come, go, borrow, lend, buy等，不能与一段时间连用。但其否定式可以与一段时间连用。
He has lived here for 2 years. 正确
He hasn’t received her letter for almost a month. 正确
He has left for 2 years. 错误
将非延续性动词转化成延续性动词
Leave-be away
Borrow-keep
Buy- have
Begin,start-be on
Die- be dead
Finish/end/stop-be over
Join-be in+组织机构
Open/close-keep sth open/closed
Fall ill- be ill
Get up- be up
Catch/get a cold-have a cold
Fall asleep-be asleep
Become-be
Come back-be back
Get to/arrive at/reach-be in
Put on-wear
Lose one’s job/work-be out of work/a job
1. A---A---A型（现在式、过去式和过去分词同形）
动词原形（现在式） 过去式 过去分词
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
2. A---A---B型（现在式和过去式同形）
动词原形（现在式） 过去式 过去分词
beat beat beaten 打
3. A---B---A型（现在式和过去分词同形）
动词原形（现在式） 过去式 过去分词
come came come 来
become became become 变
run ran run 跑
begin和start区别4. A ---B ---B型
（1）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。
动词原形（现在式） 过去式 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
（2）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。
动词原形（现在式） 过去式 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
（3）其他
动词原形（现在式） 过去式 过去分词
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
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
catch caught caught 抓住
teach taught taught 教
feel felt felt 觉得
fight fought fought 战斗
find found found 发现
get got got/gotten 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
smell smelt/smelled smelt/smelled 嗅，闻
sit sat sat 坐
dig dug dug 挖
5. A---B---C型（现在式、过去式和过去分词都不相同）
（1）在动词原形后加-n或-en构成过去分词。
动词原形（现在式） 过去式 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
（2）过去式加-n或-en构成过去分词。
动词原形（现在式） 过去式 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
forget forgot forgotten 忘记
（3）变单词在重读音节中的元音字母“i”分别为“a”（过去式）和“u”（过去分词）。
动词原形（现在式） 过去式 过去分词
begin began begun 开始
ring rang rung 按铃
sing sang sung 唱
sink sank sunk 沉
swim swam swum 游泳
drink drank drunk 饮
（4）其他不规则动词的变化。
动词原形（现在式） 过去式 过去分词
be(am, is) was/ were been 是
be(are) were been 是
do did done 做
go went gone 去
lie lay lain 躺
wear wore worn 穿
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