在留学上课时，使用正确的英语句子非常重要，以下是一些常见的课堂用语：

开始上课

Let's start class. It's time for class. Class begins!

问候

Hello, boys and girls / children. Good morning / afternoon, boys and girls / teacher / everyone. How are you today？

请求学生起立或坐下

Stand up, please. Sit down, please.

询问出勤情况

Who is on duty today？

其他常用表达

attend class

go to class

class begins!

It's time for class.

Let's begin our lesson.

这些句子可以帮助你在留学上课时更自信、更自然地交流。希望这些信息对你有所帮助!