not until用法

Not until用法

until用在肯定句,谓语动词通常是延续性动词,如stand, stay, talk, wait等,表示主句动作终止的时间。如:

1.I waited until he came back.我一直等到他回来。

2.The war lasted until 1945.战争持续到1945年。

如果用在否定句,谓语动词通常是瞬间性动词,如open, start, leave, arrive, finish, stop等,强调主句动作开始的时间。如:

3.I didn't leave the boy until his mother turned up.直到这孩子的母亲来,我才离开。

4.The noise of the street didn't stop until it was midnight.街上的噪音直到半夜才停止。