A: My sweater is worn out. 
C: You can buy one in the shop, It sells clothes there. 
A: I want to go shopping now. Can you come with me, please? I can't decide which sweater to buy. 
C: Let me help you.

shopkeeper: What can I do for you? 
customer: I'd like two woolen sweaters for my friend. 
S: Well, which colour do you like? 
C: Blue. 
S: What size do you want? 
C: Size Ten. 
S: What about this one? 
C：It looks nice. Can I try it on, please? 
S: Certainly. 
C: Well, how much does it cost? 
S: Eighty-five yuan. 
C: Oh. That's cheap. I'll have it, please.