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
A---A---B型(现在式和过去式同形)
beat beat beaten 打
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
A ---B ---B型
burn burnt burnt 燃烧
send sent sent 送
A---B---C型(现在式、过去式和过去分词都不相同)
eat ate eaten 吃
fall fell fallen 落下