Not until three years ago,did he begin to work outside.这句子中为什么不用 _英语解答

Not until three years ago,did he begin to work outside.
这句子中为什么不用 he began to work

人气：179 ℃　时间：2019-10-17 06:55:57

解答

Not until是倒装句的标志词
故需部分倒装,要把he began to work 换成did he begin加上助动词did后began要用原形begin