* She *runs* every morning. (This verb describes a physical action.)
* The dog *barks* loudly. (This verb describes a sound made by an animal.)
* He *thinks* about his future. (This verb describes a mental action.)
* They *will* *build* a house. (This verb describes a future action.)
* We *have* *eaten* breakfast. (This verb describes an action that has already happened.)
Key takeaway: Action verbs describe what the subject of a sentence does, is doing, or will do.