begin的过去式是began。
begin：v.开始；启动；起始；开始存在(或进行)；起初是；本来是；
第三人称单数： begins现在分词： beginning过去式： began过去分词： begun
Could you go back to the beginning of the story?
你能不能回到故事的开头？
Work on the new bridge is due to begin in September.
新桥定于九月份动工。
She's been working there since the beginning of last summer.
她自从去年夏初起就一直在那里工作。
She began to explain her plan of action to the group.
她开始向小组讲解她的行动计划。
温馨提示：
