If you buy these goods, you will get special discount coupons.
Excuse me, how can I get special discount coupons?
Sorry, your coupons are beyond their expiry date.
I have a coupon for buying one hamburger with one on free.
You need to take advantage of it within its expiry date.
A: Excuse me, how can I get special discount coupons?
B: Buy more and get more special discount coupons.
A: Can I get a discount coupon if I buy these goods?
B: Of course. You get a coupon for every 3 bags of sugar.
A: But how much discount can I get if I use it to buy goods next time?
B: 10 pence off if you use this coupon.
A: Can I buy everything in a supermarket by it?
B: Yeah. You need to take advantage of it within its expiry date.
A: How long can I keep it?
B: The coupon can be used at least one year.
A: I see. I will take 9 bags of sugar so that I can get 3 coupons.
B: All right. I'll get them for you.