Final answer:
The complete verb phrase in the sentence 'The foxes have escaped from the trap,' including the helping verb, is 'have escaped'. Understanding the parts of speech and verb conjugations involves recognizing subject-verb agreement and the role of verb phrases.
Step-by-step explanation:
In the sentence 'The foxes have escaped from the trap,' the complete verb phrase that contains the helping verb is 'have escaped'. Here, 'have' is the helping verb, and 'escaped' is the main verb being helped.
When identifying parts of speech in sentences and choosing the correct verb forms, it's important to recognize both the subject and the verb phrase. Subjects can take the form of noun phrases and always agree in number with their verbs. Verbs can be action words, or they can introduce states or descriptions, and they often come with auxiliaries (like 'will', 'shall', or 'have' as in the given sentence).
For linking verbs, which include words like 'seem', 'look', and 'become', they require a subject complement after them, which can be a noun phrase or an adjective providing more information about the subject.