礼貌待人是一个非常重要的社会交往原则，下面是一篇关于如何在公共场所保持礼貌的英语作文示例：

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How to be Polite in Public Places

In today's busy and crowded world, maintaining politeness and respect in public places is more important than ever. Politeness not only shows respect to others but also helps create a harmonious society.

Firstly, we should always say "please" and "thank you" when interacting with others. These simple phrases can make a big difference in how people perceive us. For example, instead of asking "Where are you？" in a harsh tone, we can say "Where are you, please？"

Secondly, we need to queue politely when waiting for services. This shows that we respect others' time and the effort put into providing those services.

Lastly, we should avoid loud talking or making excessive noise in public spaces. This not only disturbs others but also reflects poorly on our upbringing and manners.

In conclusion, being polite is a habit that requires conscious effort. By using kind words, queuing politely, and maintaining a low volume, we can make a positive impact on those around us and create a more civilized society.

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希望这篇作文能够帮助你理解如何在公共场所保持礼貌。