I`ve left someone to look agter the apartment while the men are working on it.怎么理解好?

I`ve left someone to look agter the apartment while the men are working on it.
怎么理解好?

当人们在房子里干活时,我留人在家中照看．

当那些人在公寓里工作时，我已经把公寓交给别人看护了

工人们工作的时候,我就留下一些人来照看套房.

当有工人在装修房子的时候，我要叫些人来监工