Final answer:
The helping verb 'to have' and the past participle of the main verb are used in the perfect tenses to express completed actions before a certain time.
Step-by-step explanation:
The tenses that require the helping verb 'to have' and the past participle of the main verb are perfect tenses. These tenses are used to express actions that were completed prior to a certain time or before another action. Examples of sentences using the perfect tenses include:
- I have finished my homework.
- She had eaten dinner before she went to the party.
- They will have arrived by the time we get there.
Learn more about Verb tenses in English