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

Answer 1

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

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Answer 2

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