not…until引導什麼從句

例句：

It was not until morning that the sheer scale of the damage could be seen.

直到早晨才看清了損害的嚴重程度。

It was not until 1911 that the first of the vitamins was identified.

直到1911年才發現了第一種維生素。

It was not until 1974 that his ability to write gelled again.

直到1974年，他的寫作才華才又得以發揮。

It was not until yesterday that I learned it.

頂昨天我才聽說這件事。