whenasconj.<古> 然而； 而whenadv.什么时候；当 ... 时conj.然后；可是；当 ... 时pron.什么时候n.时间When are you going up?When is the semifinal?When will you is back?When is you come back?When shall I get down?When did you graduate?When a Stranger Calls Back索命怪客When you leave the room.离开房间时随手关灯。When do the pubs shut?酒馆什麽时候关门?When using do not smoke.使用时；禁止吸烟;