adv (1)什么时候(at what time)(作疑问副词)： W～can you finish/do/return it? 你什么时候能完成/做这件事/还它? W～is she going to get married/to retire/to arrive? 她什么时候结婚/退休/到达? “I have to go on business.”“W～?” “我要出差。”“什么时候?” He didn't know/can't remember～he last wrote. 他不知道/不记得上次写信是什么时候了。She tells/asks him～to stop. 她告诉/问他什么时候停止。Since～is this building set up? 这幢楼是什么时候盖的? Until/Up to～will you stay here? 你要在这里待到什么时候? By～the house should be finished? 这房子应该什么时候竣工?

(2)在那时候(at which time)(作关系副词)：Saturday and Sunday are the days～we don't go to work. 星期六和星期日是我们休息的日子。These are the hours～the traffic is very busy. 此时正是交通高峰期。There are times～I lose my keys. 我丢了好几次钥匙了。It is the sort of time/day/afternoon～everything is in a mess. 就是在这个时候/这天/这个下午什么事都乱糟糟的。I went to bed at 10， before～I was reading for an hour. 我10点睡觉，此前我读了一小时的书。He left in 1994， since～we have never heard from him. 他是1994年离开的，以后我们一直没有他的消息。That's～he comes back home/left the home. 这就是他回家/离开家的时候。

conj(1)在(当)……时候(at the time that)：I'll call you～I get there. 到了那儿我会给你打电话。W～he listened to music， he fell asleep. 他听音乐的时候睡着了。W～finished， it will look nicer. 完成之后，它会更好看的。W～sleeping， I never hear a thing. 我睡觉时什么也听不见。W～young，we had a lot of energy. 年轻时我们精力充沛。We have to do that only～necessary. 只有在必要的时候我们才那样做。W～in trouble/in doubt， ask him for help. 遇到麻烦/拿不准时可求助于他。W～in Rome do as the Romans do.(prov) 入乡随俗。

(2)既然，鉴于(now that or considering that)：How did you get there on time～you left here so late? 既然你这么晚才离开这里，你怎么按时到达那儿的呢? Why smoke～you know it's bad for you? 你既然知道吸烟有害，为什么还吸呢?

(3)刚……就(as soon as)：The boys had scarcely got out/Scarcely had the boys got out into the street～it began to rain hard. 男孩子们刚走到街上就下起大雨来了。I had hardly opened/Hardly had I opened the door～he hit me. 我刚一打开门就遭到他的袭击。I had been back home little more than an hour～I heard that bad news. 我到家刚刚一个多小时就听到了这个坏消息。I had not been sitting for dinner for a minute～I heard the knock on the door. 我刚坐下吃饭就听见有人敲门。

(4)虽然，可是 (although)： They have kept trying～they must have known it was hopeless. 虽然他们肯定知道没有希望了，但还是坚持做下去。

(5)然后(and then)：I stayed till lunch time，～I went to the office. 我待到午饭时间，然后到办公室去了。

n时间(day or time)[C]：Have they decided the where and～? 他们确定地点和时间了吗? worried about wheres and～s 因地点和时间而焦急不安; But what I don't know is the～and how. 但是我不知道的正是时间和方式。I can't remember the～or the why of it. 我不记得这事发生的时间和原因。〖同〗time