“I” when you are the one doing something.
“Me” when something is being done to you.
So:
* “**I** went to the store” because you are the one *doing something* – you are going to the store. This means it would also be “Person and I went to the store”.
* “The cashier waved to **me**” because the cashier is the one doing something (they are waving), and it is *being done to you* (they are waving *at you*). This means it would also be “The cashier waved to Person and me”.
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