跑下楼梯用英语怎么说

"Run down the stairs"是跑下楼梯的正确英文表达方式。

其中，"run" 是动词，意思是 "奔跑"，"down" 是介词，意思是 "向下"，"the stairs" 是名词，意思是 "楼梯"。

例句：

I have to run down the stairs to catch the bus. (我必须跑下楼梯赶公交车。)
Be careful when you run down the stairs. (跑下楼梯时要小心。)
He tripped and fell while running down the stairs. (他在跑下楼梯时绊倒了。)