Verbs are action words that describe what someone or something does. They can show physical actions, like run or jump, or mental actions, like think or believe. Verbs are essential in sentences because they help convey the main idea and tell us what is happening. In addition to actions, verbs can also express states of being. For example, the verb is shows that something exists or has a certain quality. Verbs can change form to indicate time, such as past, present, or future, helping us understand when an action takes place.