What is the gerund phase for this sentence one of my favorite sounds children singing?

The gerund phrase in the sentence "One of my favorite sounds is children singing" is "children singing".

Here's why:

* Gerund: A gerund is a verb form ending in "-ing" that acts as a noun.

* Gerund Phrase: A gerund phrase is a group of words that includes a gerund and any modifiers or objects that go with it.

In this case, "singing" is the gerund, and "children" is the object of the gerund. Together, they form the gerund phrase "children singing" that acts as the noun subject of the sentence.