Mary: What are you gonna do today?
Nack: I'm gonna teach music this evening.
Mary: Do you teach music?
Nack: Yes, I do. I've been teaching music for over 10 years.
Mary: That's loooong!! What musical instrument can you play?
Nack: I can play the guitar.
Mary: Oh, I wanna be able to play the guitar some day. Please teach me playing guitar.