Grammar: The use of whose and possessive pronouns

We use the WH question Whose to identify the owner of an object:

A: Whose is this cell phone?
B: This cell phone is Sebastian’s, but this cell phone is mine.
A: Whose jacket is this?
B: It’s Celis’s, but this jacket is ++mine**.

Possessive Pronouns:
We use possessive pronouns to refer to the owner of an object:

• I - Mine: Yesika’s cell phone is Android, mine is Apple.
• You - Yours: My jacket is black, yours is red.
• He - His: Her books are about cooking, his about cars.
• She - Hers: Sebastian’s computer is Mac, hers is HP.
• It - Its
• We - Ours
• They - Theirs