8 退换商品
3句英文任你选
I'd like to exchange this sweater.
我想换一下这件运动衫。
I'd like my money back , please.
我要退款。
You can get a full refund if you have receipt.
如果出示发票可以拿到全额退款。

半个句型要记牢
get a full refund (拿到全额退款)

Tip: refund n.退款;退还;赔偿。refund还可以做动词，表示"退还;赔偿。