1. sketching - direct object

2. Swimming - subject

3. No gerund - verb phrase: are singing

4. swimming - object of preposition, about

5. Traveling - subject

6. fishing - predicate noun
    painting - predicate noun
(these 2 are known as compound gerunds used as predicate nouns.)

7. relaxing - object of preposition, for
(satisfying is a participle (adjective) modifying the noun, hobby)

8. walking - object of preposition, by

9. skating - predicate noun

10. visiting - subject
 

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