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
say，lose，meet，read，take，see，speak，swim，drink，understand的过去式和过去分词 say said saidlose lost lostmeet met metread read readtake took takensee saw seenspeak spoke spokenswim swam swumdrink drank drunkunderstand understood understood
