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引导的时间状语从句否定句 not…until…直到…才…。(not 可以用表示否定意义的词代替，比如never,nothing,seldom等)，表示某动作一直持续到某时间才开始（主句的谓语动词是非延续动词）。
扩展资料。
例句：
it was not until morning that the sheer scale of the damage could be seen
直到早晨才看清了损害的严重程度。
it was not until 1911 that the first of the vitamins was identified
直到1911年才发现了第一种维生素。
it was not until 1974 that his ability to write gelled again
直到1974年，他的写作才华才又得以发挥。
it was not until yesterday that i learned it
顶昨天我才听说这件事。
扩展资料。
例句：
it was not until morning that the sheer scale of the damage could be seen
直到早晨才看清了损害的严重程度。
it was not until 1911 that the first of the vitamins was identified
直到1911年才发现了第一种维生素。
it was not until 1974 that his ability to write gelled again
直到1974年，他的写作才华才又得以发挥。
it was not until yesterday that i learned it
顶昨天我才听说这件事。