They go to shanghai library to read books this sunday.go to shanghai library to read books,这句句子换线,

问题描述:

They go to shanghai library to read books this sunday.go to shanghai library to read books,这句句子换线,

是对话线部分提问吗,如果是答案如下:
对他们要去做什么提问用what
What will they do this sunday?