by与until的区别?请说具体些,并附上例子.

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by与until的区别?请说具体些,并附上例子.
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by与until的区别?请说具体些,并附上例子.
by与until的区别?
请说具体些,并附上例子.

by与until的区别?请说具体些,并附上例子.
by 表示“截止到某一时刻为止”,句中的实义动词一般是表示瞬间行为的:
We had to get there by evening.
我们必须在夜晚前抵达那里
或者是be动词:
You must be back by four o'clock.
你务必在4点前回来.
until / till表示“一直延续到某一时刻”,如果是肯定句,句中的动词一般是延续性动词;否定句表示“在...以前,直到...才”:
He lived in California until he was twenty.
他在加里弗尼亚一直住到20岁.
She didn't go to bed until her daughter came back.
她一直等到女儿回来才去睡觉.
I didn't wake up until I heard the alarm clock.
直到听到闹钟的铃声我才醒来.