ad.
- （用作疑問副詞）什麼時候，何時I'd like to know when they'll let him out.
我想知道他們什麼時候放他。
When did you last see Margaret?你上一次見到瑪格麗特是什麼時候？
- （用作關係副詞，引導關係子句）當……時There were times when I didn't know what to do.
有些時候我不知道該怎麼辦才好。
conj.
- 當……時John got engaged to her when travelling last winter.
去年冬天旅行時，約翰與她訂了婚。
Don't get excited when you talk.你說話時別激動。
- 既然，考慮到How can he get the promotion when his boss dislikes him?
既然上司不喜歡他，那他怎麼會獲得提升呢？
- 雖然，然而I had only fifteen dollars on me when the book I wanted cost twenty.
我身上只帶了十五元錢，可是我想買的那本書定價二十元。
- 在那時，然後
pron.
- 什麼時候，那時Since when has she taught here?
她從什麼時候開始在這兒教書的？
n.
- （事件發生的）時間[the S]
辨析
同義參見:
while
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