They are going to [ walk along the river].(变否定,疑问句,和对划线提问)

问题描述:

They are going to [ walk along the river].(变否定,疑问句,和对划线提问)

They are not going to walk along the river.(否定句)
Are they going to walk along the river?(一般疑问句)
What are they going to do?(对划线部分提问是特殊疑问名)