Question

swimming is a good exercise underline the gerund into sentence​

Answer 1

swimming is gerund ok because it has ing

Answer 2

Gerund:

Explanation:

• A gerund is any of various nonfinite verb forms in various languages; most often, but not completely, one that functions as a noun.
• In English, it's the properties of both verb and noun, such as being modifiable by an adverb and having the ability to take a direct object.
• In short, A gerund is the –ing kind of a verb that functions the same as a noun. Any action verb could be made into a gerund.

Example: Swimming is a good exercise.

Gerund: Swimming

Explanation: In the above example, the noun is swim. By attaching -ing, it becomes gerend.