The supermarket coupon
超市折扣券

Why not go to the supermarket today? The coupon will be past due in three days.
今天为什么不去超市呢？折扣券三天后就过期了。
Sure. Can we use n in Today Supermarket?
好啊。我们能在今天使用吗?

Let me check. Yes, we can.
让我看看。是的，可以。
I really don't know what to buy.
我真不知道该买些什么。