A: Hey, Professor Hill.
B: What is it?
A: I've been having trouble with derivatives.
B: That's not good. There's a test on derivatives next week.
A: I know. Can I make an appointment with you for some help?
B: I'm a busy man.
A: You didn't even check your schedule yet!
B: I know I'm busy, because many people already made appointments.
A: So I'm hopeless?
B: Of course not! There's the tutoring center.
A: But the tutors are not professors. They're just students.
B: They might surprise you.