imperative: A verb mood that indicates a command or request.

imperfect: Verb tense indicating a continuing, uncompleted, customary, or simultaneous past action.

indefinite article: Any one of the words un, una, unos, or unas used as adjectives to point out some person, place, thing, or idea, but not a specific one.

indirect object noun: Answers the question “To or for whom is the subject doing something?” and refers only to people or beloved pets.

indirect object pronoun: Replaces an indirect object noun, but is also used when the indirect object noun is mentioned.

infinitive: The unconjugated form of a verb — dormir (to sleep), for example.

interrogative adverb: An adverb used to ask a question.

interrogative pronoun: A word that replaces a noun and is used to ask a question.