Wheneyen.想当年whenadv.什么时候；当 ... 时conj.然后；可是；当 ... 时pron.什么时候n.时间When do we start boarding?When Santa's sleigh bells ringWhen cate meet small Appliance当美食遇上小家电When is my tulip's season?when blossoms scent the air.花开时节空气中充满了香味When did you leave school?When does the train start?When do you play football?When they begin the beguine.当他们开始跳起比津舞曲。When shall I stop pouring?