进店：挡推销与要试穿
一进店，店员就会迎上来："Hi, can I help you find anything?" 只想随便逛，用挡推销神句："I'm just looking, thanks."——礼貌、有效、全球通用。想试穿："Could I try this on?"，找试衣间："Where's the fitting room?"
Hi there! Can I help you find anything?
I'm just looking, thanks.
尺码、颜色、价格
问尺码的句式核心是 in："Do you have this in a medium?"（有中码吗）——in a small / in a large / in black（黑色的）/ in another color（别的颜色）全套用。问价："How much is this?" 问折扣："Is this on sale?"
Do you have this in a medium? And do you have it in black?
退货、换货、退税
退换货的第一凭证是小票（receipt）。退货拿钱："I'd like to return this."；换码换色："Could I exchange this for a different size?" 退税先在店里问："Do you offer tax-free shopping?"，离境时去机场的 tax refund counter 办理。
Hi, I'd like to return this — here's the receipt.
自测 · 学完检查一下
想真正动手做题、记进度、攒连胜？到互动课里练。
店员迎上来问 Can I help you find anything? 你只想随便看看，怎么回应最得体？
答案：I'm just looking, thanks.
just looking 是全球通用的「随便看看」，店员听到就会退开。单个 "No" 生硬；"I don't want to buy" 把话说死了（万一想买呢）；"don't follow me" 直接把服务当成了跟踪，冲突拉满。
想试穿手里这件衣服，怎么说？
答案：Could I try this on?
试穿的固定搭配是 try on。test 用于测试设备性能，且 clothes 没有单数「this clothes」；"wear this now" 像要穿走；"open the fitting room" 又是 open 直译（开门请求应是 Could you unlock...，且试衣间一般直接问 Where's the fitting room?）。
这件衣服想要中码，地道问法是？
答案：Do you have this in a medium?
尺码用 small / medium / large，句式是 in a + 尺码。middle 是「中间位置」不是衣码——middle size / my size is middle 都是「中」的直译；"Give me the M one" 意思能通但祈使句生硬。
I'd like to return this. 和 Could I exchange this? 的区别是？
答案：return 是退货拿回钱，exchange 是换成别的尺码或颜色
return = 退回商品拿回钱款；exchange = 以物换物（常用于换码换色：exchange this for a medium）。两个词方向相反，说反了店员会按错误流程处理——先想清楚你要钱还是要货。
机场办退税，找这个柜台（填一个英文单词）：Where's the tax ___ counter?
答案：refund
退税柜台叫 tax refund counter（或 tax-free / VAT refund counter）。记住 refund 这个词——退款、退税都靠它。
判断：店员迎面问 How are you today? 是想和你聊聊近况，应该认真介绍一下自己今天的安排。
答案：错
这是问候式开场白，功能等于「您好」——标准回应是 "Good, thanks!"（顺口反问一句 How are you? 更礼貌）。和餐厅的 How is everything? 一样，是打招呼不是提问，认真汇报近况反而让双方尴尬。