Could I + Verb Is?

"Could" is a modal verb used to express possibility or past ability as well as to make suggestions and requests.

What type of verb is could?

Would, should and could are three auxiliary verbs that can be defined as past tenses of will, shall, and can; however, you may learn more from seeing sentences using these auxiliaries than from definitions.

Which form of verb is used with could?

To form these past modals, use could, would, or should followed by have, followed by a past participle verb. Use have for all pronouns; never use has or had to form a past modal. Here are some examples: She could have gone to any college she wanted to.