Unit2 Cleaning DayPart AblackboardchairdeskwindowdoorclassroomblackboarddeskchairwindowdoorSinging,singing,he is singing.Dancing,dancing,he is dancing.Running,running,they are running.动词加动词加 ing表示正在进行表示正在进行Lets clean the classroomclean the windowSally is cleaning the window.clean the deskLily is cleaning the desks.clean the chairYang Ming is cleaning the chair.clean the doorWang Tao is cleaning the door.clean the blackboardHe is cleaning the blackboard.stand 站站He is standing on a chair.standShe is standing on a chair.They are cleaning the windows.
