1704964968
Since when have you been working here？从什么时候开始你在这儿工作？
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1704964970
Until when can you stay？你能待到什么时候？
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1704964972
Till when is the store open？商店开到什么时候？
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1704964974
When is the contract effective from？合同什么时候开始生效？
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也可用作连接副词，表示同样意思：
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1704964978
I’d like to know when they’ll let him out．我想知道他们什么时候会放他出来。
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When she’ll be back depends much on the weather．她什么时候回来在很大程度上取决于天气。
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1704964982
It all depends on when we can get the tickets．这得看我们什么时候能拿到机票。
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1704964984
有时可引导一个不定式短语：
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1704964986
Ask him when to open it．问他什么时候把它打开。
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1704964988
You’ll learn when to use that construction．你会知道什么时候使用这种结构。
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1704964990
（2） when可用作连词，表示“当……时”：
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1704964992
Don’t get excited when you talk．谈话时别激动。
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I will discuss this with you when we meet．我们见面时再谈这事。
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1704964996
When he got up he felt dizzy．他起床时感到头晕。
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1704964998
Herbert was having dinner when I saw him．我看到赫伯特时他正在吃晚饭。
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1704965000
When he looked back, the girl had vanished．他回头望时那姑娘已经不见了。
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从句中有些成分有时可以省略：
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1704965004
He got engaged to her when travelling last winter．他去年冬天旅行时和她订了婚。
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1704965006
Metals expand when heated and contract when cooled．金属热则膨胀冷则收缩。
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1704965008
Often she would weep when alone．她一人呆着时常常哭泣。
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When at Rome do as the Romans do．入乡随俗。（谚语）
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在某些情况下可有特殊的译法：
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I was just coming along to see you when I ran into Wilson．我正要来看你时碰到了威尔逊。
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I had not been reading for half an hour when I heard steps outside．我看书还不到半小时就听见外面有脚步声。
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