英语课堂的开场白和结束语需简洁规范，以下是权威推荐及实用示例：

一、开场白推荐

通用问候式

- Good morning/afternoon, everyone! Let's begin our class.

- Class begins. Please take out your books and notebooks.

自我介绍式

- My name is [Your Name], and I'll be your teacher for today's session. Let's make this a productive class.

- Hi, my dear children... Let's introduce ourselves and get started.

主题引入式

- It's time to start today's lesson. Let's focus on what we're going to learn.

- Today, we'll explore [topic] through various activities.

二、结束语推荐

常规收尾式

- Class is over. You may pack up your things and leave.

- That's all for today. Thank you for your participation.

总结强调式

- Let's review what we've learned and prepare for tomorrow.

- I hope you found today's lesson helpful. See you next time!

三、注意事项

简洁性：

避免冗长，建议控制在3-5句内；

权威性：优先参考高权威来源（如教育机构官方资料）；

互动性：可适当加入学生自我介绍或小游戏环节，提升课堂活跃度。