英语教师在上课时常用的口头语言可分为以下几类，综合多个权威来源整理如下：

一、课程开始类

开场白

- Let's start now. / Let's begin our class. / It's time for class.

- 用于正式开启课程，引导学生进入学习状态。

课堂常规

- Stand up, please. / Sit down, please.

- Open your books, please. / Please return to page 12.

- 用于维持课堂秩序和基本教学流程。

二、课堂互动类

提问与反馈

- Who can tell me what we learned today？

- Can you explain this concept in your own words？

- 用于检查学生理解情况并鼓励参与。

小组活动

- Work in groups and discuss...

- Each group present your findings to the class.

- 促进学生合作与交流。

三、时间管理类

考勤与进度

- Who is on duty today？ / Is everyone here？

- Let's review what we've covered so far.

- 用于管理课堂出勤和教学进度。

时间提醒

- We have 15 minutes left for this topic.

- Let's move on to the next activity.

- 帮助学生合理规划学习时间。

四、语言技能类

发音与表达

- Please speak slowly and clearly.

- Model the pronunciation for you.

- 专项训练学生语言输出能力。

文化渗透

- This word is used in American English.

- Let's learn the cultural background behind this phrase.

- 增强学生的语言应用意识。

五、课堂总结类

归纳要点

- Let's summarize the main ideas today.

- The key takeaways are...

- 帮助学生梳理知识体系。

作业布置

- Write a short essay on...

- Prepare for the quiz next class.

- 明确学习任务与反馈渠道。

以上分类综合了不同教学场景下的常用表达，实际教学中教师会根据具体需求灵活运用。建议教师结合自身风格和课程目标，选择适合的口语模板，并根据学生反馈进行调整优化。