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连接词
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用法
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例句
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when,
while,
as
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when既可表示时间段，也可表示时间点，表示主句和从句的动作同时发生或从句的动作先于主句的动作发生
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When she came in, I stopped eating.
When I lived in the countryside, I used to carry some water for him.
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while强调主从句的行为或状态同时发生或存在，从句用延续性动词
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While my wife was reading the newspaper, I was watching TV.
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as通常和when通用，另外它还表示“随着……，一边……一边……”
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You can feel the air moving as your hand pushes through it.
Our headmaster laughed as she spoke.
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before
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表示“在……之前，还未……就……，还没来得及……就……”
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Einstein almost knocked me down before he saw me.
My father had left for Canada just before the letter arrived.
They had not been married for four months before they were divorced.
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It will be /was＋时间段＋before表示“多久之后才……”
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It will be four days before they come back.
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since
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since从句中的谓语动词一般是非延续性动词，主句的谓语动词用完成时
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I have been in Beijing since you left.
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用在“It is＋时间段＋since...”中，表示“自从……以来已经多长时间了”；since从句中的动词如果是延续性的，则理解为“某一动作已经结束多久了”
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It is three years since he began to smoke.
It has been /is three years since we met last time.
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until /till
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用于肯定句，表示主句谓语动词的动作一直持续到某一时间为止
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We shall wait until /till he comes back.
Everything went well until /till that accident happened.
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用于否定句，构成not...until句型，意为“直到……才……”
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I didn't go to bed until I finished my homework.
I didn't leave until /till she came back.
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not until置于句首，主句用部分倒装语序
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Not until she stopped crying did I leave.
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用于强调句型：It is /was not until... that...
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It was not until the meeting was over that he began to teach me English.
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after
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……之后
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After we had finished the work, we went home.
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once
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一旦……
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Once you start, you will never give up.
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whenever
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无论何时
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You are always welcome whenever you come.
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as soon as，
immediately，
instantly，
directly, the
minute /
moment
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充当连词引导时间状语从句，表示主从句的动作同时发生，意为“一……就……”
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As soon as I reach Canada, I will ring you up.
They phoned her immediately they reached home.
He said he'd turn on TV the moment he got home.
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no sooner...
than, hardly /
scarcely... when
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意为“刚……就……”，no sooner, hardly, scarcely后用过去完成时， than, when后用一般过去时； no sooner, hardly, scarcely置于句首时，主句要部分倒装
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He had hardly fallen asleep when he felt a soft touch on his shoulder.
He had no sooner arrived home than he was asked to start on another journey.
No sooner had the sun shown itself above the horizon than he got out of bed to commence work.
Hardly had I sat down when he stepped in.
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each time，
every time，
any time, the
first /last time
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用作连词，引导时间状语从句，分别意为“每当……”，“每次……”，“任何时刻”，“第一次/上一次……”
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Each time he came to Harbin, he would call on me.
You grow younger every time I see you.
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by the time
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表示到某一时间为止，主句要用完成时
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By the time you came back, I had finished this book.
By the time you come here tomorrow, I will have finished this work.
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