关于英语情景对话的公式化表达，综合多个权威来源的信息，可归纳为以下核心句型结构及使用场景：
一、日常交流类
询问近况 A: How's your day going？
B: Pretty good, thanks! How about you？
表达需求
A: I need help with my homework.
B: Sure, what do you need help with？
提供帮助
A: Can you pass me the salt？
B: Of course!
二、购物场景
询问商品
A: How much is this shirt？
B: It's $20.
颜色/尺寸选择
A: Do you have this in blue？
B: Yes, we do.
讨价还价
A: This is too expensive! Can you give me a discount？
B: We can't reduce the price, but we'll pack it for you.
三、餐厅用餐
点餐
A: I'll have the steak, medium rare.
B: Coming right up!
催促服务
A: The food is taking too long!
B: I'll inform the manager right away.
结账
A: Could I pay by card？
B: Certainly! Here's your receipt.
四、交通出行
询问路况
A: How do I get to the station？
B: Take the subway at the third stop.
道歉与解释
A: I'm sorry, I'm late.
B: It's okay, I was waiting.
租车场景
A: Can I rent a car for the day？
B: Sure, the rate is $50.
五、特殊场景
意外情况处理
A: My bike is broken!
B: Let's call a bike repair service.
紧急情况沟通
A: There's a fire!
B: Stay calm! Follow the evacuation route.
六、常用表达补充
表示感谢： Thank you very much! 表达歉意
建议与请求：Could you please...？
以上句型可根据具体场景灵活调整，建议结合实际对话练习使用。若需进一步细化某个场景，可提供更具体的对话需求。
