Is this your shirt?
TEACHER:Whose shirt is that?
TEACHER:Is this your shirt, Dave?
DAVE: No. Sir. It's not my shirt.
DAVE: This is my shirt. My shirt's blue.
TEACHER: Is this shirt Tim's?
DAVE: Perhaps it is, sir. Tim's shirt's white.
TEACHER:Tim!
TIM: Yes, sir?
TEACHER:Is this your shirt?
TIM: Yes, sir.
TEACHER:Here you are. Catch!
TIM: Thank you, sir.