Answer:
"A popular pastime for retirees is camping near a lake."
Gerund Phrase: camping near a lake
Noun Use: the gerund helps in complementing the subject.
Step-by-step explanation:
A gerund phrase is a phrase which starts with a gerund and it functions as a noun. A gerund is a verb which functions as a noun in the sentence. The verb ending with an -ing is said to be a gerund. A gerund functions as a noun, subject, or object in the sentence. In the above sentence 'camping near a lake'.