在课堂上，你必须认真听老师讲，并记好笔记。

You must listen to the teacher carefully and take notes in class.

youdao

在课堂上你应该认真听老师讲课。

You should listen to the teacher carefully in class.

youdao

在课堂上，你必须认真听老师讲，并记好笔记。

I need to take down notes for the class.

youdao

在课堂上，你必须认真听老师讲，并记好笔记。

Take notes to help you remember what the teacher says.

youdao

在课堂上，你必须认真听老师讲，并记好笔记。

Take notes to help you remember what the teacher says.

youdao