zhang:wow,what a beautiful pen!When did you buy it?
yang:Thank you!I didn't buy it myself.My mother bought it for me as a birthday gift.
zhang:Oh,I see.Does it write well?
yang:Of course.You can have a try.
zhang:Ok ,let me try it.
Great!It writes smoothly.Where did you buy it?
yang:Er..I don't know.I have to ask my mother,then I will tell you.
zhang:Ok,I am waiting for you .