退税: Tax refund
退税单: Tax-refund form
退税发票: Tax invoice
办理退税: Claim a refund
全额退款: A full refund
退货条款: Return policy
句型：1. Does this price include tax?
2. How much do I have to spend to get a tax refund?
3. How much refund will I get?
4. Would you tell me how to claim the refund?
5. How long does it take to get the tax refund?
1. There are no refunds on sale items.特价商品是不能退款的
2. They'll sort it all out for you.
3. How long is a credit note good for?
4. I'll need to issue the refund back to the credit card that you made the purchase with.
常用场景句型结构: sort out; issue the refund; act up; must have done sth.单词的使用: defective, full