their children could not read or write because they were too poor to send them to the school.改错
问题描述：
their children could not read or write because they were too poor to send them to the school.改错
答
their children could not read or write because they were too poor to be sent to school
答
they和them所指得他们不一样.they指的是家长,them指的是他们的小孩,their 指的是家长的.可以改成 their children could not read or write because they were too poor to send their children to the school.(them 改成 their children)