I. 判断动词-ing形式在句中所作的成分。 1. Walking is good for everyone. ( ) 2. Our job is playing all kinds of music. ( ) 3. We shall appreciate hearing from you again. ( ) 4. Do you know the boy lying under the tree? ( ) 5. People come to theme parks, looking for excitement. ( ) 6. On the hill, he saw smoke rising from the chimneys. ( ) Conclusion: 动词-ing形式在句中可作_______, _______, _______, _______, _______, _______。

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