whenness时间性
whenadv.什么时候;当 ... 时conj.然后;可是;当 ... 时pron.什么时候n.时间
When the waves harshly stomping.当水浪暴躁的碰撞时。
When did the earthquake occur?
When will come the millennium?
When did he turn professional?
When you are old by---yeates当你年老时
When will this mystery unfold?
When was the reservation made?
When will your holidays begin?