1. The dog barked loudly at the mailman. ("barked" is the action verb)
2. She is a talented musician. ("is" is a linking verb)
3. We have been studying all week. ("have been" is a helping verb)
4. The children will play in the park. ("will play" is a future tense verb)
5. They had eaten dinner before I arrived. ("had eaten" is a past perfect verb)