Possession:
* This book is mine. (indicating ownership)
* The red car in the driveway is mine. (indicating ownership)
* That toy is yours, and this one is mine. (distinguishing between possessions)
Pronoun:
* The cat sat on my lap, purring contentedly. I stroked its fur, enjoying its presence.
* The dog wagged its tail, and I gave it a treat.
* This is my favorite hat. It keeps my head warm in the winter.
Other uses:
* The mine is located in a remote area. (referring to a place where minerals are extracted)
* He blew up the mine to stop the enemy advance. (referring to an explosive device)
* I'm going down to the mine to get some coal. (referring to a place where minerals are extracted)
Using "mine" in a sentence can be tricky because it has multiple meanings. Make sure you understand which meaning you want to use in the context of your sentence.