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:
①Not until the teacher came in did the students stop talking.直到老师进来学生们才停止讲话.
②Not until next week will the sports meet be held.直到下周才开运动会.
至于时态就要根据实际的句子在能决定,没有说一定用什么时态的.
等立连词这个说法没听过,貌似英语中没有,个人见解,仅供参考.