当旅游时需要使用英语与外国人交流，以下是一些常用的旅游英语表达：1. 问路和询问景点信息：Can you tell me how to get to the museum? / What are some good places to visit in town?2. 预订餐厅和点餐：I'd like to book a table for two at 7 pm tonight. / Can I have the chicken dish with extra vegetables？3. 酒店入住和咨询：Hello, I'd like to check into my room now. / Do you have any fitness facilities available in the hotel?4. 购物和询价：How much does this shirt cost? / Can you show me another size in this shoe?5. 描述景点和分享旅行经验：The view from the top of the mountain was breathtaking./ I had an amazing time exploring the local culture there.6. 处理突发情况和寻求帮助：Excuse me, can someone help me find my lost passport?/ Where is the nearest hospital around here?除了以上常用表达外，还建议了解一些常见的英语习语、当地文化和礼仪等，以便更好地融入当地的社交环境。同时可以通过学习APP或参加语言课程来提高自己的英语水平。