原形 过去式 过去分词 意思 am/is was been 是 are were been 是 bear bore born 忍受 beat beat beaten 打;敲打 become became become 成为;变成 begin began begun 开始 blow blew blown 吹 break broke broken 打坏;打破 bring brought brought 带来 build built built 建筑;建设 burn burnt burnt 燃烧 buy bought bought 买