People -1--in big cities are often busy and have to work for

People _1.living__in big cities are often busy and have to work for a life.
再问： Why
再答： are才是这句话的谓语，所以要填非谓语形式living ，living in big cities 在这里做状语修饰主语people
再问： 非谓语形式?
再答： 嗯，live是动词，在这里用现在分词形式living，也是非谓语中的一种
再问： 这句话是不是也能说成people are often busy and have work for。。。。。。in big cities
再答： 嗯，但是不及原始句表达的意思精确