We give a discount for cash.

现金交易可打折扣。

Can you give a discount?

你能给我一个折扣吗？

Do you give a discount for a largo order?

大批订购贵方会提供折扣吗？

Do you give a discount if we buy it in large quantity?

如果我们买的数量多，你会给我们折扣吗？

Do you give a discount if we buy it in large quantities?

如果我们购买的数量多，你能不能给打折扣？