understand的过去分词是什么？ 过去式：understood过去分词：understood
第三人称单数，现在分词，过去式，过去分词) die prefer understand study know try read steal stop live dies 过去式died 过去分词died 现在分词dying prefers 过去式preferred 过去分词preferred 现在分词preferring understands 过去式understood 过去分词understood 现在分词understandingstudies 过去式studied 过去.
过去式和过去分词 1.lend-lent-lent2.understand-understood-understood3.forget-forgot-forgotten4.fly-flew-floen5.can-could-没有6.may-might-没有7.will-would-没有5，6，7属于情态动词，没有过去分词
