The correct choice is "Annette, Jim, and I were at…" because "Annette, Jim, and I" is the subject of the verb "were" (to be) and "I" is a subject pronoun. Sometimes it helps to take out the other people in the subject and listen to which pronoun sounds better: "I was" or "me was"? It may be more obvious that "me" sounds incorrect and "I" sounds correct.
Below are some examples of "I" in subjects with more than one person:
Below are some examples of "me" in objects with more than one person:
In casual speech you may hear "me" used in subjects with more than one person, but it should not be used in formal writing.
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