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副词 adv. 什么时候,何时
at what time
· When can you come to see me?
你什么时候来看我?
· When did you go to bed last night?
昨晚你什么时候睡觉的?
· When are you going to return it?
你准备什么时候还（书）?
副词 adv. 是…时候
at which;on which
· Please tell me when we'll have the meeting.
请告诉我我们什么时候开会.
· I wonder when that was.
我不知道那是什么时候的事.
副词 adv. 在…的时候
at or during which
· How I regretted the days when I had played and should have studied!
我多么懊悔我本该好好学习却玩掉了的那么多的日子!
副词 adv. 那时
but at that moment
· It happened on a day in November when the weather was very wet and cold.
这事发生在十一月的一天,那时天气又潮湿又寒冷.
· We were about to start,when it began to rain.
我们刚要出发时开始下雨了.
连词 conj. 当…时
at the time when
· It happened when I was living in the country.
这事发生在我住在农村的时候.
· It was raining when we arrived.
我们到达时,天正下着雨.
· He always comes on those days when I am busy.
他总在我忙的日子来.
· I was walking along the stream,when I met my teacher of English.
当我沿着小溪散步时遇到了英语老师.
连词 conj. 一…就
immediately after
· When I had finished dinner I went to bed.
我吃完饭就睡觉了.
· She was very surprised when she saw me.
她见到我非常惊讶.
· Let us set out when the sun has risen.
太阳一出来,我们就动身.
代词 pron. （关系代词）那时
which time
· I came here in 1949, since when I have been engaged in this work.
我1949年到这里,从那时起我就担任这项工作.
· We came a week ago,since when the weather has been bad.
我们在一星期前来此,从那时起天气就一直不好.
代词 pron. （疑问代词）什么时候
what time
· Since when have you been here?
你从何时起在此地?
· Until when can you stay?
你能呆到什么时候?