What does an I.O. do in a sentence? I.O. means indirect object.

Yes. Either stated or understood will be one of the 4 words: to, for, at, from

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Indirect objects tell "to whom or what or for whom or what" after a transitive verb.

She gave ME a bouquet of flowers.

Check this site for more explanation and examples.

http://www.chompchomp.com/terms/indirectobject.htm

In a sentence, the abbreviation "I.O." stands for "indirect object." The indirect object is a noun or pronoun that comes after the verb and before the direct object. It usually answers the questions "to whom?" or "for whom?" in regards to the action of the verb.

To identify the indirect object in a sentence, you can follow these steps:

1. Identify the verb: Find the action verb in the sentence.
2. Ask "to whom?" or "for whom?": Determine who or what is receiving the direct object of the action.
3. Ask "to/for what?": Determine the purpose or intended recipient of the action.

For example, in the sentence "John gave Mary a book," the verb is "gave." By asking "to whom?" (or "for whom?"), you find that the indirect object is "Mary." By asking "to what?" (or "for what?"), you find that the direct object is "a book." Therefore, the indirect object is "Mary" because she is the one receiving the book.

Understanding how to identify the indirect object helps clarify the relationships between the subject, verb, direct object, and the one to whom or for whom the action is directed.