Here's a breakdown:
* Verb: A word that describes an action, state, or occurrence. (e.g., run, sing, think)
* Noun: A word that names a person, place, thing, or idea. (e.g., dog, school, book, happiness)
* Gerund: A verb form ending in "-ing" that functions as a noun. (e.g., swimming is my favorite activity, running is good exercise, reading relaxes me.)
Examples:
* Running is good exercise. (Running is the subject of the sentence.)
* I enjoy swimming in the ocean. (Swimming is the object of the verb "enjoy".)
* Eating too much candy is unhealthy. (Eating is the subject of the sentence.)
Note: Gerunds can be used as the subject, object, or even the complement of a sentence.