英国留学上课时，以下是一些常见的课堂用语：
1. 开始上课
Let's start class.
It's time for class.
Class begins!
2. 问候
Hello, boys and girls / children.
Good morning / afternoon, boys and girls / teacher / everyone.
How are you today？
3. 请求学生起立或坐下
Stand up, please.
Sit down, please.
4. 询问出勤情况
Who is on duty today？
Who's helping this morning / today？
Is everyone / everybody here / present？
Is anyone away？
这些用语有助于维持课堂秩序，确保教学活动顺利进行。