until 意为“直到;在........之前”。注意 until 和 not.....until 在用法上的区别。在带有 till 或 until 引导的时间状语从句里
如果主句用肯定式,其含义是“一直到..时”,谓语动词只能用延续性动词
如果主句用否定式,其含义是“直到..才..”, 谓语动词可用瞬间动词。
The young man read till the light went out. Let’s wait until the rain stops.
We won’t start until Bob come Don’t get off until the bus stops. Continue in this direction until you see a sign.
I didn’t wake up until I heard the alarm clock. 直到听到闹钟的铃声我才醒来