In which sentence is the word singing a gerund?

Question

A.
The hikers enjoyed the singing birds.

B.
The birds kept singing.

C.
The birds’ singing filled the park.

D.
The birds are singing a cheerful song.

Answer 1

The word "singing" is a gerund in sentence A: "The hikers enjoyed the singing birds." In this sentence, "singing" is functioning as a noun that describes the type of birds.

In sentence B, "singing" is a present participle, and in C, it is also a noun but part of a possessive construction, while in D, it acts as a present participle as part of the verb phrase.