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Unit2CleaningDayblackboardchairdeskwindowdoorclassroomblackboarddeskchairwindowdoorSinging,singing,heissinging.Dancing,dancing,heisdancing.Running,running,theyarerunning.动词加ing表示正在进行Let’scleantheclassroomcleanthewindowSallyiscleaningthewindow.cleanthedeskLilyiscleaningthedesks.cleanthechairYangMingiscleaningthechair.cleanthedoorWangTaoiscleaningthedoor.cleantheblackboardHeiscleaningtheblackboard.stand站Heisstandingonachair.standSheisstandingonachair.Theyarecleaningthewindows.