Selena bought a cat for her little sister
The word "I" is used for the subject of a sentence: I went to the store. You and I bought the book. The word "Me" is used for the object of a sentence, phrase, etc. He bought it for me.
We bought coffee as well as tea.
I bought a brand of bread.
Jack bought a quart of milk.
He bought a colouring book for his daughter.
She bought beautiful silk damask curtains.
I bought an apple and an elephant at the African store in Africa.
My dad bought me an amulet for my birthday
he bought the estate and all its appurtenances
My mum bought me a assorted pack of biscuits.
he knew the stock was a speculation when he bought it
The cheap knife I bought broke and was a gimcrack.