當主句是否定句時,它引出的意思是"直到（某時）（某動作）才（發生）" ,這時候常會出現"not until …"的結構,如果將 "not until …"的結構放在句首,那么主句要寫成倒裝句.

其結構為:Not until+從句/表時間的詞+助動詞+(主句)主語+謂語+.

①Not until the teacher came in did the students stop talking.直到老師進來學生們才停止講話.
②Not until next week will the sports meet be held.直到下周才開運動會.

2.not until的強調結構為:It is / was not until+從句/表時間的詞+that+:
③It was not until the teacher came in that the students stopped talking.
④It is not until next week that the sports meet will be held.

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