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)beat beat beaten 打3. 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。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。build buil
