Could you tell me when they will leave Beijing?

请问他们什么时候离开北京？

youdao

The production unit of the Beijing film Studio will leave Beijing for other parts of the country to film the exterior next month.

北京电影制片厂摄制组下个月去外地拍外景。

《新英汉大辞典》

When did your father leave Beijing?

你父亲什么时候离开北京的？

youdao

Mr Abbas is due to leave Beijing tonight, with Israeli Prime Minister Benjamin Netanyahu heading from Shanghai to the capital tomorrow.

BBC: China media: Middle East mediation

For now, there are no plans for the children to leave Beijing.

CNN: Year later: New beginning for survivors

It's a sad certainty: Mere months, if not weeks, after the hordes leave the Olympic village in Beijing, most of the competitors--even the medalists--will slip from international consciousness.

FORBES: Magazine Article