LOOK! I -> my, you -> your, she -> her, he -> his. It's my birthday. I'm ten! It's your birthday. You're eleven! It's her birthday. She's nine. It's his birthday. He's twelve.

Completed section:

• I → my: It's my birthday. I'm ten!
• you → your: It's your birthday. You're eleven!
• she → her: It's her birthday. She's nine.
• he → his: It's his birthday. He's twelve.