导购口语:

We may either pay you an allowance or have the goods replaced.

我们或者给你折价，或者给你换货。

We could exchange them for you if you like.

我们可以给您换一双。

If you have the receipt, I can replace it for you.

如果您有发票，我可以给您换。

语句解析:

Pay you an allowance给你折价；have the goods replaced给你换货；exchange sth. for sb. / replace sth. for sb.都表示“为某人换某物”。

情景再现:

There is something wrong with the plug. I'll get you another one.

这个插头有问题，我给您换一个。

You can exchange it, provided that you haven't taken off the tag.

只要你没有把吊牌拿掉便可换货。