上课同学们好请坐用英文怎么说

"Good morning/afternoon/evening, class. Please be seated."

"Good morning/afternoon/evening"是用来问候上课时间的常用语，"class"是指上课的群体。 "Please be seated" 是请坐的意思，是用来礼貌地请听课的人坐下的常用语。

例句：

Good morning, class. Please be seated. (早上好,同学们.请坐)
Good afternoon, class. Please be seated. (下午好,同学们.请坐)
Good evening, class. Please be seated. (晚上好,同学们.请坐)