They started to play the piano one or two hours ago．（改为同义句）
They started to play the piano________ ________ ________two ago．
The Blacks got married thirty years ago. （改为同义句）
The Blacks have for thirty years.
Documentaries are less funny than comedies. （改为同义句）
Documentaries funny comedies.
I heard a girl sing in the next room.（改为被动语态）
A girl heard sing in the next room.
I will ask someone.Someone likes serious movies. （改为定语从句）
I will ask someone serious movies.
That school art festival was very wonderful. （改为感叹句）
the school art festival was!