句型转换
It has been in use since 1998.(划线提问)
has it been in use?
The game is called Travel in Space.（划线提问）
the game ___________?
To be a good student is quite difficult.(改为同义句)
difficult to               a good student.
Daniel bought a new printer.(改为被动语态)
A new printer                            by Daniel.
I spent much time buying books.（改为同义句）
It               me much time                             books.