1. The dog barked loudly at the mailman. (The verb "barked" describes the action of the dog.)
2. She is reading a book. (The verb "is" helps connect the subject "she" to the action "reading".)
3. I will bake a cake for his birthday. (The verb "will bake" describes a future action.)
4. The children have played in the park all day. (The verb "have played" describes a completed action.)
5. The sun sets in the west. (The verb "sets" describes a natural phenomenon.)