Writing, reading, and cooking are things humans do with their hands and minds. Flying, barking, and purring are actions only animals like birds, dogs, and cats do.

Writing is an action you perform with a pencil or pen, so it is something a person does. Every action verb answers, What does the subject do?

Flies is the word that tells what the bird is doing with its wings. Bird and house are nouns—they name things, not actions.

Cooks shows what Mom does at the stove—she prepares food using heat. Mom is the subject and dinner is what she makes.

Purrs is the special sound cats make when they are happy, just like barks is the sound dogs make. Each animal has its own action sound.

Read is the action verb because it tells what we do with the books. Books and library are both nouns—one names a thing and the other names a place.

Fly names something a bird or plane actually does—moving through the air. That movement makes it an action verb.

Pretty describes how a person or thing looks, which makes it an adjective. Nobody is ever pretty-ing something—it is not an action.

Animals run, eat, swim, and bark—all of those are actions. Anything alive that moves or does something uses action verbs.

Cook really is an action verb because it names what a chef does to food using heat. The statement claims it is not, so it is wrong.