句型转换（ 10分）
I think I can play the piano.（改为否定句）
I　　 　　think I　　 　　play the piano.
How is the weather there?  (改为同义句)
the weather　　 　　there?
He rode his bike to school yesterday. (对划线部分提问)
he go to school yesterday?
He cleans his room every day. ( 用now 替换 every day)
He　　 　　 　　 　　his room now.
Where are tigers from? ( 改为同义句)
Where　　 　　tigers　　 　　from?