'I' will always be the subject of a sentence or clause, whereas 'me' will be the object. 'Me' should follow any preposition (of, in, on, etc.) and function as both the indirect and direct object in a sentence.
Following these rules will ensure professionalism when speaking to others and will make a good impression.
Incorrect: The professor returned the tests to John and I.
Correct: The professor returned the tests to John and me.
Explanation: You remove the second party from the sentences where you feel tempted to use 'myself' as an object or feel hesitant about 'me'.
