【在线英汉词典】参考了简明英汉词典，美国传统词典，现代英汉词典，现代英汉综合大辞典，英汉公共大词典，英汉双解计算机词典，美国传统词典，英汉电力大词典等诸多英汉词典，收集整理了二万多个常用的英语单词，提供在线英语单词when翻译查询，when的中文解释。
简明英汉词典
when
[(h)wen]
conj.
就在那个时候, 在...的时候
adv.
什么时候, ...的时候
pron.
什么时侯, 那时
美国传统词典[双解]
when
when
AHD:[hwμn, wμn]
D.J.[hwen, wen]
K.K.[hwWn, wWn]
adv.（副词）
At what time:
什么时候：
When will we leave?
我们什么时候离开?
conj.（连接词）
(1)At the time that:
在…的时候：
in the spring, when the snow melts.
在春天，当雪融化的时候
(2)As soon as:
一…就…：
I'll call you when I get there.
我一到那里就给你打电话
(3)Whenever:
无论什么时候：
When the wind blows, all the doors rattle.
只要风一吹，这门就吱嘎作响
(4)During the time at which; while:
在…期间，当…时：
When I was young, I was sick all the time.
在我小时候我总是生病
(5)Whereas; although:
虽然，尽管：
She stopped short when she ought to have continued.
尽管她应该继续下去，她却突然停住了
(6)Considering that; if:
考虑到，如果：
How can he get good grades when he won't study?
他不用功的话怎么拿高分呢?
pron.（代词）
What or which time:
什么时候：
Since when has this been going on?
从什么时候起事情象这样?
n.（名词）
The time or date:
时间或日期：
Have they decided the where and when?
他们已经定下来地点和时间了吗?
语源
(1)Middle English
中古英语
(2)from Old English hwenne * see k wo-
源自 古英语 hwenne *参见 k wo-
用法
In informal style when is often used after be in definitions: A dilemma is when you don't know which way to turn. The construction is useful, but it is widely regarded as incorrect or as unsuitable for formal discourse. In formal style there is no alternative but to rephrase such definitions to avoid is when : A dilemma is a situation in which you don't know which way to turn. You are in a dilemma when you don't know which way to turn.
在非正式文体中when 常在定义中用在 be 后面： 进退两难就是当你不知道该走哪条路的时候。 这个结构是有用的，但被广泛认为它对正式交谈来说是不正确的或者是不合适的。在正式文体中没有替代词，只能改变措辞以避免is when ： 进退两难就是这样一个你不知道该怎么办的处境。 当你不知道你该做什么时你就处于进退两难的维谷了
现代英汉词典
when
[wen; (?@) hwen]
adv.
(1)什么时候
When can you come?
你什么时候能来？
(2)当…的时候
at the time when we met
在我们见面的时候
I lived in this village when I was a boy.
当我还是个孩子的时候我住在这个村庄里。
词性变化
when
conj.
(1)…的时候
Edison was not a good student when he was a young boy.
爱迪生小时候不是一个成绩好的学生。
When the plane arrived, some of the detectives were waiting inside the main building while others were waiting on the airfield.
当飞机抵达时,一部分侦探等在主楼里面,而另一部分则等在停机坪上。
When I came home my wife was cooking dinner.
我回家时，妻子在做晚饭。
(2)如果；要是；既然
I can't tell you when you won't listen.
既然你不想听，我就不告诉你了。
(3)其实
He stopped trying, when he might have succeeded next time.
他不再试了，其实他可能下一次就成功。
习惯用语
hardly when
刚…就
Hardly had I opened the door when he told me.
我刚开开门，他就告诉了我。
(= scarcely when)
词性变化
when
pron.
(1)什么时候
When else shall we meet again, if August 1st is not convenient for you?
要是八月一日对你不方便,那么另外什么时候再碰头呢?
He then asked when Mr Gilbert would be allowed to go home.
然后他又问,什么时候可以允许吉尔伯特先生回家。
Since when have he had a car?
他从什么时候起开始有了一辆汽车？
(2)那时
She wrote a month ago， since when we've heard nothing.
一个月前她来过信，从那时起我们就没听到过她的消息。
The Ambassador's wife went on asking questions, when she suddenly noticed a big hole in her husband's hat.
大使的妻子继续问了好多问题,突然她发现丈夫帽子上有个洞。
现代英汉综合大辞典
when
[(h)wen]
adv.
(1)[疑问副词]什么时候, 何时
(2)[关系副词]当...时
When will he come?
他什么时候来?
It was a time when motorcars were rare.
那是汽车很罕见的时代。
I still remember the night when Nanjing was liberated.
我还记得南京解放那天晚上的情景。
词性变化
when
[(h)wen]
conj.
(1)当...时
(2)一... 就...
(3)如果
(4)虽然; 然而; 可是
(5)既然
(6)考虑到; 那时; 然后
It was raining when we started.
我们动身时正下着雨。
We'll start when the team leader comes.
队长一来, 我们就出发。
Turn off the switch when anything goes wrong with the machine.
如果机器发生故障, 就把电门关上。
We have only three books when we need five.
虽然我们需要五本书, 却只有三本。
Why use wood when you can use plastic?
既然能用塑料, 为什么还要用木料?
We played outside till sunset, when it began to rain.
我们在户外一直玩到太阳下山, 那时天下起雨来了。
when
[(h)wen]
pron.
(1)[疑问代词]什么时候
(2)[关系代词]那时
Since when have you been here?
你从何时起就在这个地方的?
We came a week ago, since when the weather has been bad.
我们一星期前来到这里, 从那时起天气一直不好。
when
[(h)wen]
n.
(事件发生的)时间 the when and where of an act 行为发生的时间和地点
Tell me the when and the why (=reason) of it.
请告诉我时间和原因。
继承用法
whenissued
adj.
(股票, 证券)虚股的
whenness
n.
时间性[关系]
用法词典
when
中古英语 whenne＜古英语 hwenne
参考词汇
when,as,while这三个词都可以引出时间状语从句，它们的差别是：when 从句表示某时刻或一段时间 as 从句表示进展过程，while 只表示一段时间
When he left the house, I was sitting in the garden.
当他离开家时，我正在院子里坐着。
When he arrived home, it was just nine o'clock.
当他到家时，正是九点钟。
As he grew older, he became more intelligent.
随着他年龄的增长，他变得更有才智了。
While he was in London,he studied music.
当他在伦敦时，他学习音乐。
While she was typing the letter,the telephone rang.
当她在用打字机打那封信时，电话响了。
[七国语言]英汉公共大词典
when
当时候;何时
美国传统词典
when
when
AHD:[hwμn, wμn]
D.J.[hwen, wen]
K.K.[hwWn, wWn]
adv.
At what time:
When will we leave?
conj.
(1)At the time that:
in the spring, when the snow melts.
(2)As soon as:
I'll call you when I get there.
(3)Whenever:
When the wind blows, all the doors rattle.
(4)During the time at which; while:
When I was young, I was sick all the time.
(5)Whereas; although:
She stopped short when she ought to have continued.
(6)Considering that; if:
How can he get good grades when he won't study?
pron.
What or which time:
Since when has this been going on?
n.
The time or date:
Have they decided the where and when?
语源
(1)Middle English
(2)from Old English hwenne * see k wo-
用法
In informal style when is often used after be in definitions: A dilemma is when you don't know which way to turn. The construction is useful, but it is widely regarded as incorrect or as unsuitable for formal discourse. In formal style there is no alternative but to rephrase such definitions to avoid is when : A dilemma is a situation in which you don't know which way to turn. You are in a dilemma when you don't know which way to turn.
英汉航空大词典
when
n.在...时候
英汉化学大词典
when
什么时候;adv.什么时候
英汉计算机大词典
when
什么时候;adv.什么时候
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