曾几何时：when用法大全
Is life always this hard, or is it just when you're a kid?
——Leon
人生总是这么苦么，还是只有在小的时候？
——《这个杀手不太冷》
一、关于when，你应该知道的用法有
adv.
1.什么时候，何时，什么情况下，什么场合下 at what time; on what occasion
I'd like to know when they'll let him out.
我想知道他们什么时候放他。
2.（用语时间的表达方式之后）在那时，其时 used after an expression of time to mean 'at which' or 'on which'
The Queen's last visit was in May, when she opened the new hospital.
女王上次来访是在五月份，她那时主持了这座医院的落成典礼.
3.其时，当时，当场 at which time; on which occasion
conj.
1.在……时候，当……时，在……期间 at or during the time that
Here the local were always barbered at this hour on this day.
原来本地人老是在这一天这个时候这个地方理发。
2.在……之后 after
When I mingled with other families I distinctly discerned how peculiarly fortunate my lot was.
在我接触到别的一些家庭之后，我清楚地体会到自己可谓得天独厚的天之骄子。
3.在任何……时候 at any time that; whenever
You can save the game at any time when you're at your bunk.
任何时候你都可以在你的床位储存你的游戏。
4.一……就，刚……就 just after which
He is prone to lose his temper when people disagree with him.
人家一不同意他的意见，他就发脾气.
5.考虑到，既然 considering that
Why use wood when you can use plastic?
既然能用塑料，何必非用木料？
n.
时间 time
pron.
什么时候，何时 what / which time
Considerate products know when to bend the rules
体贴的软件知道什么时候调整规则
二、词义辨析：还有以下单词能表示“在……的时候”的意思
when, while, as
这些连词均可表示“当……时”引出时间从句。
when所引导的从句，其谓语动词既可是持续动词，也可是短暂动词；谓语动词动作发生的时间可以与主句谓语动词的动作是同时，或之前、之后。
while句中的谓语动词应为持续动词，不用短暂动词，谓语动作发生的时间通常与主句谓语动词动作发生时间是同时。
as侧重指从句与主句的动作同时进行，谓语动词可以是持续性的，可以是短暂性动词。
三、接下来，做个填词游戏吧
The last time I went to Scotland was in May, ____ the weather was beautiful.
我上次去苏格兰是在五月份,那时的天气好极了。
