Grandpa: "Jing, you must tie your hair after bath."
Jing:" OK, then you have to tie it for me."
Grandpa:" I don;t know how to tie."
Jing just gave her comb and rubberband to grandpa and said :" You must learn just like what you have teach me LEARN THE THING THAT YOU DON"T KNOW, right?"
Grandpa, speechless and "try" to tie her hair.