你最好立刻把它拖干净用英语怎么说

"You'd better clean it up right away."

"You'd better" 意为"你最好"，是一种礼貌的建议。
"Clean it up" 意为"把它拖干净"。

一些例句如下：

"You'd better take out the trash before it starts to smell." (你最好在开始臭味之前把垃圾倒掉。)
"You'd better finish your homework before watching TV." (你最好在看电视之前完成你的家庭作业。)
"You'd better put your dirty dishes in the dishwasher." (你最好把你脏的盘子放进洗碗机里。)

可以看出， "You'd better" 通常用来给出建议或提醒，并强调应该尽早采取行动。