2. 动词-ing形式的作用： 观察下列例句，思考划线部分作用。 (1) This is an interesting book. ( ) (2) The man sitting by the window is our maths teacher. ( ) (3) Seeing the teacher entering the room, the students stood up. ( ) (4) I saw the boy walking on the street yesterday. ( ) (5) Playing football is his favorite sport. ( ) (6) I didn’t stop working last night. ( ) (7) My work is teaching English. ( )

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