The spacecraft is coming back to Earth next year.（对next year提问）
when will the spacecraft come back to Earth.
Please bring it back to me tomorrow.（改为同义句）
please return it to me tomorrow.
We want to travel around the world.（改为否定句）
None of us wants to travel around the world.
应该是这样改的,望采纳O(∩_∩)O.