become的过去式

become的过去式是什么 become的过去式 become的过去式是什么 become的过去式 become的过去式是什么啊? become的过去式 drink的过去式 eat的过去式是什么. fly的过去式 bright的过去式 become的过去式 become过去式 become的过去式和过去分词 become这个单词的过去式是什么? 动词的过去式：study look clean become write 几个单词的过去式wear become meet drive sound become 过去式过去分词是什么? have become过去式只改have，become不用改吗？ fly,become,spend,go,see,eat,have,ride,give,do.的过去式和ing形式是什么 写出下列单词的过去式 drink swim fly live walk die hit come become 写出动词的过去式go,join,start,can,begin,take,win,become,see,tour,stop,hiccup 英语动词的变化,in many ways my disability has helped me grow stronger psychologically and become more independent.这里become 为什么用原形,而不用过去式呢?