Final answer:
The verb in the sentence "The Willow Equine Rescue Barn has been helping horses in trouble." is "has been helping". The verb in the sentence "Some of the horses there are suffering from injuries." is "suffering". The verb in the sentence "A few were mistreated by their owners." is "were mistreated".
Step-by-step explanation:
In the sentence "The Willow Equine Rescue Barn has been helping horses in trouble." the verb is "has been helping". This is a present perfect continuous verb tense, indicating an ongoing action that started in the past and continues to the present.
In the sentence "Some of the horses there are suffering from injuries." the verb is "suffering". This is a present progressive verb tense, indicating an ongoing action or state of being.
In the sentence "A few were mistreated by their owners." the verb is "were mistreated". This is a past simple verb tense, indicating an action that happened in the past and is now complete.