一：wascooking,waswashing,wassweeping,left,wasplaying,saw,wasselling,found,wascooking,rang 　　二：when,when,while,while,while,while 　　三：1:MaricaandhermotherwerepiayihgchesswhileAnnaandherfriengswerehavingapicnic.2:JoewaswateringtheflowerswhileDavywascleaningtheroom.3:Eve'sparentswerecookingdinnerwhileEvewaswatchingTV. 　　一：were,at,was,was,at,drawing,very,course,monent(minute) 　　二：putting,started,had,clean,wasleaning,lost,waswashing,knocked,cut,waspeeling 　　三：GDFEHCA