小学英语教师在课堂上常用的一些语句包括：

开始上课

It's time for class.

Let's begin our class.

Class begins.

招呼学生

Hello, boys and girls.

Good morning/afternoon, boys and girls.

Hi, everyone!

课堂指令

Let's get ready for class.

Be quiet, please.

Stand up.

Sit down.

No Chinese, OK？

Look at me.

Listen to me, please.

Understand？

Who'd like to try？

Attention, please!

Are you ready？

Louder.

课堂活动

Open your books, please.

Please take out your book.

Let's have a break.

Time is up.

That's all for today!

Class is over.

结束课程

Goodbye, everyone!

See you next time.

See you later.

Bye-bye.

其他常用语

I'm sorry I'm late. / Excuse me for coming late.

Please come earlier next time.

Is everyone here？

What day is it today？

What is the weather like today？

Here are your exercise books. Please hand them out.

Give me a hug.

Let's sing the "goodbye" song together.

这些语句可以帮助教师有效地管理课堂，维持秩序，以及激励学生参与课堂活动。