when
柯林斯词典
1. QUEST You use when to ask questions about the time at which things happen. 什么时候 (用于疑问句，询问某事发生的时间)
When are you going home?
你什么时候回家？
When did you get married?
你是什么时候结婚的？
2. CONJ If something happens when something else is happening, the two things are happening at the same time. (表示两件事同时发生) 当…的时候
When eating a whole cooked fish, you should never turn it over to get at the flesh on the other side. 吃一整条做熟的鱼时，你永远都不要把鱼翻过来吃另一边的肉。
3. CONJ You use when to introduce a clause in which you mention something that happens at some point during an activity, event, or situation. 当…时 (引导从句，表示从句中提到的事发生在另一活动、事件或情况期间)
When I met the Gills, I had been gardening for nearly ten years. 我结识吉尔一家时，我已经几乎做了十年的园艺。
4. CONJ You use when to introduce a clause where you mention the circumstances under which the event in the main clause happened or will happen. 在…情况下 (引导从句，表示从句中提到的情况是主句中已经发生或即将发生的事的前提)
When he brought Imelda her drink she gave him a genuine, sweet smile of thanks. 当他给艾梅尔达拿来一杯饮料时，她给了他一个真诚、甜美、表示谢意的微笑。
5. CONJ You use when after certain words, especially verbs and adjectives, to introduce a clause where you mention the time at which something happens. 什么时候 (用在某些词尤其是动词和形容词后，引导从句说明某事发生的时间)
I asked him when he'd be back to pick me up. 我问他什么时候回来接我。
6. PRON-REL You use when to introduce a clause that specifies or refers to the time at which something happens. 当…的时候 (引导表示某事发生的具体时间的从句)
He could remember a time when he had worked like that himself. 他还记得当他自己也像那样工作的那段时间。
7. CONJ You use when to introduce the reason for an opinion, comment, or question. 既然 (用于引入观点、评论、或问题的原因)
How can I love myself when I look like this?
既然我这么一副样子，我怎么能爱我自己？
8. CONJ You use when in order to introduce a fact or comment which makes the other part of the sentence rather surprising or unlikely. 而 (引出令人吃惊的事实或评论)
Our mothers sat us down to read and paint, when all we really wanted to do was to make a mess. 我们的妈妈们让我们坐下读书、画画，而我们真正想要做的却是胡闹一阵。
返回 when
when /wɛn/
剑桥词典
- at what time ; at the time at which
- I rang them yesterday to check when they were arriving .
- So when did you start collecting antique glass ?
- She was 74 years of age when she wrote her first novel .
- What did you miss most about England when you were living in France?
- Who will be in charge of the department when Sophie leaves ? 返回 when
什么时候，何时
"I did tell you about it." "When? I don't remember ." “我确实告诉过你这件事。”“什么时候？我不记得了。”
When are you going? 你什么时候走？
When's the baby due ? 婴儿会在什么时候出生？
We'll go when you're ready . 你准备好了我们就出发。
Tell me when to start . 告诉我什么时候开始。
Ask him when he's next coming home . 问问他下次什么时候回家。
When do you expect to have the project completed (by)? 你预计这个项目什么时候完成？
She was only 20 when she had her first baby . 她生第一个孩子时只有20岁。
He was shocked when I told him. 我告诉他时他非常震惊。
I hate it when there's no one in the office . 我讨厌办公室里一个人也没有。
I went there when I was a child . 我小的时候去过那里。
I was just getting into the bath when the phone rang . 我正要洗澡，电话响了。
例句