What can I do for you? May / Can I help you? 你要买什么？

　　I want / I’d like a pair of sports shoes for my son.

　　我要为我儿子买双运动鞋。

　　How much is it? 多少钱？

　　That’s too expensive, I’m afraid. 恐怕太贵了。

　　That’s fine. I’ll take it. 很好，我买了。

　　How many / much do you want? 你要多少？

　　What color / size / kind do you want?

　　你要什么颜色/多大/什么种类？

　　Do you have any other kinds / sizes / colors?

　　你有其它种类/尺寸/颜色的吗？

　　I bought this blouse here last week, but there seems to be something wrong with it.

　　我上周在这儿买的罩衫，好像出问题了。

　　Can you change it? 你能换一下吗？

　　I insist that you give me my money back.

　　我坚持要求退钱。

　　[案例探究]

　　—It’s just the one I want. _________

　　—Three hundred and eighty yuan.

　　A. Can I take it? B. How much is it?

　　C. What’s its size? D. Is that expensive?

　　答案与解析：B。根据下文售货员的答语Three hundred and eighty yuan. 可知顾客肯定问的是“多少钱？”