知识扩展
用法解析
动词短语,表“跑下楼梯”,run为动词(跑),down the stairs(下楼梯)作地点状语,down表“向下”,特指从楼梯上跑下来
用法示例
He ran down the stairs quickly to catch the bus.(他快速跑下楼梯去赶公交车。)Don’t run down the stairs, it’s dangerous.(不要跑下楼梯,很危险。)
对应短语
对应短语:run up the stairs(跑上楼梯);过去式:ran down the stairs;stairs为复数,不可说run down the stair