这里的free是形容词,the families are free to move from job to job.
这里的搭配不是leave sb do sth,是leave sb/sth+形容词的格式.
e.g.Leave the door open.----把门敞开着
The bomb blast left many people dead.----炸弹爆炸造成许多人死亡.free后面唯一的关键词就是一个动词to move,from job to job是用来修饰to move的.to move是修饰free这个形容词的.这些家庭自由了,怎么个自由法呢?自由是指能够迁居的自由.
free to do sth意为能够自由做某件事,如You are free to stay up until eleven tonight.-----今晚你可以到11点才睡觉.