Final answer:
The verb phrase in the sentence is helping verb + helping verb + action verb.
Step-by-step explanation:
The verb phrase in the sentence "You could have been cleaning your room all night!" is helping verb + helping verb + action verb. The helping verbs in the sentence are "could", "have", and "been", and the action verb is "cleaning". These helping verbs combine with the action verb to form the complete verb phrase that expresses the action of the sentence.
Learn more about Linguistics