not until在句首可以用过去完成时吗?

可以. 当Not until位于句首时,句子要倒装.其结构为:Not until+从句/表时间的词+助动词+(主句)主语+谓语+.如:1. Not until he had accomplished his mission did he realize that he was seriously ill.直到他完成了...那如何区分用过去完成时和过去时呢应该是根据句意吧。