when

[wen]

adv.什么时候, 当 ... 时
conj.然后, 可是, 当 ... 时
pron.什么时候
n.时间

ad.

1. (用作疑问副词)什么时候, 何时

I'd like to know when they'll let him out.

我想知道他们什么时候放他。

When did you last see Margaret?

你上一次见到玛格丽特是什么时候?

2. (用作关系副词, 引导关系从句)当……时

There were times when I didn't know what to do.

有些时候我不知道该怎么办才好。

conj.

1. 当……时

John got engaged to her when travelling last winter.

去年冬天旅行时, 约翰与她订了婚。

Don't get excited when you talk.

你说话时别激动。

2. 既然, 考虑到

How can he get the promotion when his boss dislikes him?

既然上司不喜欢他, 那他怎么会获得提升呢?

3. 虽然, 然而

I had only fifteen dollars on me when the book I wanted cost twenty.

我身上只带了十五美元, 可是我想买的那本书定价二十美元。

4. 在那时, 然后

pron.

什么时候, 那时

Since when has she taught here?

她从什么时候开始在这儿教书的?

n.

(事件发生的)时间[the S]

词形变化

动词过去式: whelmed | 动词过去分词: whelmed | 动词现在分词: whelming | 动词第三人称单数: whelms |

词义辨析

同义参见:

while  

英英释义

名词 whelp:

young of any of various canines such as a dog or wolf

同义词：pup

动词 whelp:

birth

同义词：pup

补充

whenwhen英:[hwen] 美:[hwɛn, wɛn]adv.1.什么时候2.在那时, 其时conj.1.在…时, 当时2.如果, 要是When the weather is good, I usually go to the country.若是天气好的话, 我总是到乡下去。3.既然, 考虑到pron.1.什么时候2.那时

例句

1. when did he go?他什么时候离开的？ 2. when is the press conference?记者招待会何时举行？ 3. when were you in this house last?你上次待在这所房子是什么时候？ 4. I'll be there this afternoon.—when?我今天下午会到那儿。——什么时候？ 5. She was reading when I came in.我进来的时候她正在读书。 6. I met my wife four years ago when her daughter was nine.四年前我遇到我妻子的时候, 她的女儿九岁。 7. I'll have a talk with you when I get back.我一回去就会找你谈话。 8. when we'd crossed the border, we started to relax.一穿过边境, 我们便放松下来。 9. when he brought Imelda her drink, she gave him a smile.当他把饮料拿给伊梅尔达时, 她朝他笑了笑。 10. I'll start to think about it when I have to write my report.我要写报告时会对此予以考虑的。 11. It's not easy when you're a teenager.这对于十来岁的孩子来说不容易。 12. It does not produce hydrogen when added to dilute acids.加入到稀酸时不会产生氢气。 13. when making pastry, always handle the ingredients as little as possible.做油酥点心时要尽量少触碰调料。 14. I don't know when the decision was made.我不知道这个决定是什么时候做的。 15. It is important to check when the laboratory can do the tests.核实一下实验室何时可以进行这些测试很重要。 16. How can I love myself when I look like this?我这个样子, 怎么能对自己满意呢？ 17. How did you pass the exam when you'd not worked for it?你都没有下功夫, 怎么可能通过考试？ 18. I thought I was wrong when in fact I was right.我认为自己错了, 而事实上我是对的。 19. on the day when I met him在我见到他那天 20. He could remember a time when he had worked like that himself.他还能记得自己一度工作起来也是那个样子。 21. He told us when to eat.他告诉我们什么时候吃饭。 22. He came at six, when the sun was setting.他六点钟来的，那时太阳正落山。 23. He came at a time when we needed help.正在我们需要帮助的时候他来了。 24. when we are at college当我们还在大学的时候 25. The runners started when the gun went off.枪声一响，赛跑运动员就起跑了。 26. She smiles when you praise her.每当你夸她的时候她就笑。 27. to complain of one's lot when one might change it本来可以改变自己的命运，却自怨命苦 28. How can he help when they won't let him?既然他们不让他帮，他怎么能去干呢? 29. when did you last see him?.你上次见到他是什么时候？。 30. [with prep.]since when have you been interested?.你从什么时候开始感兴趣的？。 31. when can I see you?.我何时能见到你？。 32. when would such a rule be justifiable?.在什么情况下，这样的规定无可非议？。 33. Saturday is the day when I get my hair done.星期六是我做头发的日子。 34. I loved maths when I was at school.我在学校时喜欢数学。 35. call me when you've finished.你完成后打电话给我。 36. can you spare five minutes when it's convenient?.如果方便的话，你能抽出5分钟的时间吗？。 37. he had just drifted off to sleep when the phone rang.他刚迷迷糊糊地睡下，这时电话铃就响了。 38. why bother to paint it when you can photograph it with the same effect?.既然拍照也能达到同样的效果，你干吗要费事去画它？。 39. I'm saying it now when I should have told you long ago.我早就应该告诉你了，可是我现在才说。 40. when did she arrive?她什么时候到的？ 41. I don't know when she arrived.我不知道她是什么时候到的。 42. Sunday is the day when I can relax.星期天是我可以轻松一下的日子。 43. I last saw her in May, when she was in London.我上次见她是在五月份，当时她在伦敦。 44. He jumped up when the phone rang.电话铃响时他跳了起来。 45. Why do you want more money when you've got enough already?你的钱既然已经够用了，为什么还要更多的呢？ 46. when will you return?你什么时候回来？ 47. when did the American Civil War begin?美国南北战争是什么时候开始的？ 48. The detective asked me when I last saw her.警探问我最后一次看见她是什么时候。 49. when is the next performance?下一场演出是什么时候？ 50. (Do you) remember when that happened?（你）还记得那是什么时候发生的吗？ 51. It was a time when people didn't have to lock their doors.那个时代人们连门都不用锁。 52. the happy days when we were together我们在一起的欢乐时光 53. "We're still waiting for the test results, when we'll decide our next move."我们现在还在等考试结果，出结果后我们再决定下一步行动。 54. I can say I knew you when. [=I knew you before you were famous or successful]可以说你还没成名时我就认识你了。 55. We went fishing when [=while] we were on vacation.我们度假时去钓鱼了。 56. I'll leave when you do. [=I'll leave at the same time as you]当你离开时，我也会离开。 57. "when he finally showed up, he was drunk."当他最终露面时，他已喝得醉醺醺的。 58. "when I was in school, we didn't have computers."我上学的时候，我们还没有电脑。 59. You can go when the bell rings.铃一响，你就可以走了。 60. Call me when you get home.你一到家就给我打电话。 61. Things were better when he got a job.他找到工作后，情况就好转了。 62. I cry when [=whenever] I hear that song.我一听到那首歌就会哭。 63. "when he watches television, he falls asleep."他一看电视就会睡着。 64. "when you have no family, you are really on your own."如果没有家人的支持，你确实就得靠自己了。 65. We take the bus to school when it rains.如果下雨，我们就乘公共汽车上学。 66. A contestant is disqualified when she disobeys the rules.如果她违反规则，她的竞争者资格就会被取消。 67. "when and if he comes, you can ask him. = If and when he comes, you can ask him."如果他过来，你可以问他。 68. Why buy a newspaper when you can read the news online for free?既然你能在网上免费读新闻，为什么还要买报纸呢？ 69. "How can he buy the house when he has no money? [=he has no money, so how can he buy the house?]"既然没钱，他怎么能买得起房子呢？ 70. She quit politics when she might have had a great career in it.尽管可能会大有作为，她还是退出了政坛。 71. Tomorrow is when we must decide.我们必须在明天做出决定。 72. "He retired in 1998, since when he has been devoting his time to gardening."自从1998年退休以后，他就把时间用来干园艺活。 73. You need the report by when?你什么时候要那份报告？