(1) AAA型(动词原形、过去式、过去分词同形) cost(花费) cost cost cut(割) cut cut hit(打) hit hit hurt 伤害) hurt hurt let(让) let let put(放) put put read (读) read read (2) AAB型(动词原形与过去式同形)
can could shall should will would may might AAA型 cost cost cost cut cut cut hit hit hit hurt hurt hurt let let let must must must put put put set set set shut