Steven: Excuse me, how can I get special discount coupons?
Seller: Buy more and get more special discount coupons.
Steven: Can I get a discount coupon if I buy these goods?
Seller: Of course. You get a coupon for every 3 bags of sugar.
Steven: But how much discount can I get if I use it to buy goods next time?
Seller: 10 pence off if you use this coupon.
Steven: Can I buy everything in the supermarket by it?
Seller: Yeah, you need to take advantage of it within its expiry date.
Steven: How long can I keep it?
Seller: The coupon can be used at least one year.
Steven: I see. I will take 9 bags of sugar so that I can get 3 coupons.
Seller: All right. I will get them for you.

史蒂文：麻烦问下，我怎样才能得到特价的优惠券？
卖主：买的多就多送特价优惠券。
史蒂文：如果我买这些东西我能得到一张减价的优惠券吗？
卖主：当然可以了。每买三袋糖就可获得一张优惠券。
史蒂文：但是如果我下次用它去买东西会优惠多少呢？
卖主：凭此券可优惠10便士。
史蒂文：我可以用它买超市里的任何东西吗？
卖主：是啊，你需要在过期之前把它用了。
史蒂文：优惠券多长时间内有效啊？
卖主：一年内都可以用。
史蒂文：我明白了。我要买9袋糖，也就可以得到3张购物券了吧。
卖主：好的，我帮你拿。