英语教师在课堂上常用的一些语句包括：

开始上课

Let's start class. = It's time for class.

问候学生

Hello, boys and girls / children.

Good morning / afternoon, boys and girls / teacher / students / teachers, morning好/下午好

课堂组织

Stand up / Sit down, please.

Who is on duty today？

Who's absent？

Be quiet, please.

Listen carefully.

Watch carefully.

课堂开始前的准备

before class begins 上课前

Come on now 快走啊

Let’s wait outside our classroom.让我们在教室外面等一会吧

Let’ go in.咱们进去吧

Hurry up快点

Hi, guys, let’s go inside

课堂物品管理

Here are your exercise books. Please hand them out. 这是你们的练习本，请发下去.

Please take out your

这些语句涵盖了课堂开始、问候、组织、准备和物品管理等方面，是英语教师在课堂上常用的表达方式。