when的用法：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...
