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100

Is Gerund a verb form that ends in -ing and functions as a noun in a sentence?

Yes

100

“Swimming in the ocean is my favorite activity.” What is the gerund from this sentence?

Swimming 

100

What is the structure of gerund?

Verb + -ing

200

“A relaxing activity is swimming in the ocean.” From the previous sentence, is it a gerund or no?

No, it’s not a gerund

200

“They are afraid of losing the match.” Does this sentence uses a gerund as the object of a preposition?

Yes

200

"My favorite hobby is painting." What is the function of a gerund in this sentence?

subject complement

300

“Understanding how earthquakes happen involves knowing about the Earth’s tectonic plates.” Which ones are the gerunds from this sentence?

Understanding and knowing

300

In “I can’t imagine living without music,” living without music is...

A gerund phrase as object of imagine.

300

“Swimming every morning keeps me healthy while I am watching the sunrise.” From this sentence which verb-ing is not the gerund?

Watching