Help the hungry roommate figure out who ate their lunch by choosing the correct word for each gap in the text message.

Hey! Did you eat my sandwich? Yesterday, I left it in the fridge right behind the milk. That delicious turkey sub was completely mine! You need to buy a new one for me right now, or I am changing the Wi-Fi password.

Hey! Did you eat my sandwich?

We use the possessive determiner "my" before a noun (sandwich) to show ownership.

Yesterday, I left it in the fridge right behind the milk.

We use the subject pronoun "I" because the speaker is the one doing the action (leaving the sandwich).

That delicious turkey sub was completely mine!

We use the possessive pronoun "mine" to stand alone and replace "my sandwich."

You need to buy a new one for me right now, or I am changing the Wi-Fi password.

We use the object pronoun "me" after the preposition "for."