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