Okay, let's interview some classmates and write down their answers about their birthdays, following the example in the textbook:
A: Whose birthday is in spring?
B: Mine.
A: When's your birthday?
B: It's on the 5th of May.
A: How old are you?
B: I'm 12.
Here's what I found out from my classmates:
Classmate 1:
A: Whose birthday is in spring?
Classmate 1: Not mine.
A: When's your birthday?
Classmate 1: It's on the 10th of November.
A: How old are you?
Classmate 1: I'm 11.
Classmate 2:
A: Whose birthday is in spring?
Classmate 2: Mine!
A: When's your birthday?
Classmate 2: It's on the 22nd of April.
A: How old are you?
Classmate 2: I'm 12.
Classmate 3:
A: Whose birthday is in spring?
Classmate 3: Nope, not me.
A: When's your birthday?
Classmate 3: It's on the 1st of August.
A: How old are you?
Classmate 3: I'm also 12.