Identify the gerund in the following sentence: "Swimming is fun."

The correct identification of the gerund in the sentence "Swimming is fun" is indeed "Swimming." A gerund is a verb form that ends in -ing and functions as a noun in a sentence. In this case, "Swimming" serves as the subject of the sentence, which indicates an activity or action.

In this context, it represents the act of swimming in a general sense, emphasizing the activity itself rather than a specific instance of swimming. The verb "is" functions as a linking verb, connecting the subject to the complement "fun," which describes the subject. Therefore, the use of "Swimming" as a noun functioning as the subject is what makes it the gerund in the sentence.