You should put away your suitcases before you leave.

在你离开前把你的箱子收好。

youdao

"I wish I could go to sleep before you leave me," he said rather shyly.

“我希望在你离开我之前我能睡着。”他相当害羞地说。

youdao

See that all the doors are locked before you leave.

一定要确保所有的门都锁好了再走。

《牛津词典》

"Wouldn't you like to go meet Missus Trotter once before we leave?"

VOA: special.2010.04.24

And please sign in, by the way, guys, before you leave.

顺便说一下，同学们在离开之前请签名。

耶鲁公开课 - 1945年后的美国小说课程节选

Please make sure you drop your library card at the front desk before you leave.

请确保在离开时，把图书卡放在前台。

have to 实战 - SpeakingMax英语口语达人

"I don't see the point of giving yourself jet lag before you leave, " says Alfred J.

WSJ: To Avoid Jet Lag This Summer, Travel Like a Scientist

Bright's emergence as one of Australia's premier cycling hubs is evident even before you leave town.

BBC: Exploring Australia��s High Country on two wheels

Like a deemed sale, it is computed at fair market value the day before you leave.

FORBES: Best French Exports: Bread, Brie, Fashion and Taxes