"I" is used:
* As the subject of a verb: It performs the action.
* Example: *I* went to the store. (You are the one going)
* After the verb "to be" when it's the subject:
* Example: It was *I* who answered the phone.
"Me" is used:
* As the object of a verb: It receives the action.
* Example: She gave the book to *me*. (You are receiving the book)
* As the object of a preposition: A word that shows the relationship between a noun or pronoun and another word in the sentence (e.g., to, from, with, by, on).
* Example: The dog ran between *me* and my friend.
Tricky Situations:
* Compound Subjects/Objects: When you have two pronouns, the pronoun that would be correct if it were alone in the sentence is the one you use.
* Example: *My sister and I* went to the movies. (You would say "I went...")
* Example: The teacher gave the book to *my sister and me*. (You would say "The teacher gave the book to me...")
* After "Than" or "As"
* Example: She is taller *than I*. (You would say "She is taller than I am")
* Example: He is as strong *as me*. (You would say "He is as strong as I am")
In a nutshell: Think of "I" as the "doer" and "me" as the "receiver".
Let me know if you'd like more examples or have any other pronoun-related questions!