not until用法：基本结构：not主句+until+从句；倒装句结构：Not until+从句+倒转的主句（主倒从不倒）；not until后边还可跟介词短语。

not until的例句：It was not until yesterday that I learned it（顶昨天我才听说这件事）；Not until we pointed out their fault to them did they realize it（直到我们向他们指出了他们的错误，他们才意识到）。