都有吧,要看句意.如果when意为“这时”,那么主句用进行时,从句用一般时例：We were shouting loudly in the kitchen when suddenly dad came in.如果when意为“当……时候”主句可以用一般时,从句用进行时（注意这里...都对啊……两种用法都有，仔细看看我的讲解（其中那个while是我拓展的……）