同学们下午好，下半学期开始由我上你们的英语课。现在开始上课，先跟老师学起立和坐下用英语翻译

Good afternoon class, I'll in charge of teaching your English from this semester. Now, let's begin our class.

Let's start with "stand up, please" and "sit down, please"... Follow me..."stand up, please" .... "sit down,please"

Good afternoon everybody,I am your English teacher from the second half semester.Now let's begin our class,at first we should learn "stand up"and "sit down".

Good afternoon everyone,
I am going to teach your English from the beginning of this Half term. Now, we are having class. At first, I would like to talk about the translation of "stand up" and "sit down".

stand up起立
sit dowm坐下