when
US
UK when adv: (at what time?)
SC 什么时候 shén me shí hòu
TC 什麼時候
TC 什麼時候
SC 何时 shén me shí hòu ，hé shí
When did she leave work? At three o'clock?
她什么时候下班的？三点钟?
when adv: (at which time?)
SC 哪个时候 něi gè shí hòu
TC 哪個時候
TC 哪個時候
SC 什么时候 něi gè shí hòu ，shén me shí hòu
TC 什麼時候
TC 什麼時候
When did she leave? Was it at four or five PM?
她哪个时候离开的？是下午四点还是五点?
when adv: (how soon?)
SC 多快 duō kuài
SC 多久 duō kuài，duō jiǔ
TC 多久
TC 多久
SC 何时 duō kuài，hé shí
When can you leave?
你还要多久能离开？
when adv: (how long ago?)
SC 多久以前 duō jiǔ yǐ qián
When did she leave? Twenty minutes ago?
她多久以前离开的？二十分钟前？
when conj: (if)
SC 如果 rú guǒ
TC 如果
TC 如果
When it rains, all traffic stops.
如果下雨，所有交通都会停止。
when conj: (whereas) (转折语)
SC 而，然而，可是 ér，rán ér，kě shì
TC 而，然而，可是
TC 而，然而，可是
What are you doing in Madrid when you are supposed to be in Paris?
当你应该在巴黎时，你在马德里做什么？
when conj: (at the point in time that)
SC 当…的时侯 dāng … de shí hòu
SC 在…时 dāng … de shí hòu ，zài … shí
TC 在...時
TC 在...時
This was all happening when he suddenly arrived home.
事情正在发生时他忽然回来了。
when conj: (at a time in the past)
SC 在（过去的某个）时候
I started playing tennis when I was nine years old.
我在9岁的时候就开始打网球。
when n: (a particular time)
SC 时间 shí jiān
TC 時間
TC 時間
SC 时刻 shí jiān ，shí kè
TC 時刻
TC 時刻
We've decided the where of the meeting and need to tie down the when.
我们已经决定了会议地点，还需要敲定会议时间。
when pron: (what date)
SC 什么时候 shén me shí hòu
TC 什麼時候
TC 什麼時候
SC 何时 shén me shí hòu ，hé shí
Since when is nudity permitted in court?
什么时候开始，法庭上容许出现裸体了？
at the time when adv: (during that period) (过去的某个时间)
SC 当…的时候 dāng de shí hòu
At the time when dinosaurs roamed the Earth, there was no human life.
back when adv: (at a time in the past when)
SC 当…时 dāng shí
TC 當...時
TC 當...時
SC 回到…时 dāng shí，huí dào shí
Back when I was a boy, there was no such thing as Nintendo Wii.
when the s*** hits the fan expr: slang, vulgar (disturbing facts: become public) (俚语，粗俗)
SC 暴露于众
SC 公之于众 gōng zhī yú zhòng
if and when expr: (possibly in the future)
SC 如果那时
SC 只有当....的时候
inquire whether/when/how, enquire whether/when/how vtr: formal (with clause: ask)
SC 问 wèn
TC 問
TC 問
SC 询问 wèn，xún wèn
TC 詢問
TC 詢問
Fred inquired whether Larry had time to help him move this weekend.
Lucie enquired when the next train for King's Cross departed.
弗莱德询问拉里这周末是否有时间帮他搬家。// 露西询问开往国王十字车站的下一趟火车何时出站。
inquire as to whether/when/how/who/what, enquire as to whether/when/how/who/what vtr: formal (with clause: ask)
SC 询问 xún wèn
TC 詢問
TC 詢問
I am writing to inquire as to whether your company has any vacancies.
我来信是想询问贵公司是否有职位空缺。
instruct [sb] that/when/where vtr: (with clause: inform [sb]) (接从句)
SC 告知 gào zhī
SC 通知 gào zhī ，tōng zhī
TC 通知
TC 通知
The officials were instructed that their duties included ensuring health and safety rules were adhered to.
no matter when adv: (at whatever time)
SC 无论何时 wú lùn hé shí
TC 無論何時
TC 無論何時
SC 随便什么时候
You can always phone me, no matter when.
no matter when expr: (with clause: regardless of when)
SC 不管何时 bù guǎn hé shí
TC 不管何時
TC 不管何時
No matter when I go, there always seems to be a long queue.
only when necessary adv: (strictly as required)
SC 只在必要时 zhī zài bì yào shí
You must take the pain killers only when necessary.
pigs might fly, pigs can fly, when pigs fly expr: (that will never happen)
SC 不可能的事 bù kě néng de shì
SC 异想天开 bù kě néng de shì，yì xiǎng tiān kāi
TC 異想天開
TC 異想天開
Say when! interj: informal (indicate [sth] is enough)
SC 够了就请告知
SC 好了就说一声
As the hostess began to pour wine into her guest's glass, she cried, "Say when!"
Since when? interj: informal, expressing surprise (for how long?)
SC 从什么时候开始？
Ned and Ellie are going out? Since when?
since when expr: informal, expressing disapproval (how long ...?)
SC 什么时候开始
SC 何时起
Since when have you been in charge? Stop telling me what to do!
since when expr: (from that time)
SC 从那时起 cóng nà shí qǐ
TC 從那時起
TC 從那時起
Olivia joined the company two years ago, since when she has instigated several major changes.
when all is said and done adv: informal (ultimately) (非正式用语)
SC 最后，结果，尘埃落定 zuì hòu，jié guǒ，chén āi luò dìng
TC 最後，結果
TC 最後，結果
When all's said and done, you've no right to an opinion on this.
when else conj: (at what other time)
SC 其他什么时候
If you can't see me today, I don't know when else we'll be able to get together.
when else adv: (at another time)
SC 别的什么时间合适？
If not now, when else?
When in Rome ..., When in Rome, do as the Romans do expr: (act according to local customs)
SC 入乡随俗
when it comes to [sth] expr: (with regard to)
SC 说到，谈到 shuō dào，tán dào
TC 談到
TC 談到
I love to read, but I have trouble when it comes to studying science.
我喜欢读书，不过一说到科学课我就不行了。
when push comes to shove expr: (when things become difficult)
SC 到了紧要关头
SC 事态严重时
when the chips are down adv: informal, figurative (in a difficult situation) (非正式用语，比喻)
SC 最后，结果，尘埃落定 zuì hòu，jié guǒ，chén āi luò dìng
TC 最後，結果
TC 最後，結果
When the chips are down, are you brave enough to keep going?
when your ship comes in expr: figurative (when you are rich or successful)
SC 当你成功时
SC 当你有了钱