句型转换
She often does her homework at night. (变为否定句)
She                              her homework at night.
We are cleaning our classroom now. (对划线部分提问)
                  you          now?
He likes pandas because they are very cute. (对划线部分提问)
                he        pandas?
I think he is in the classroom.（改为否定句）
I        think he        in the classroom.
Mr Black is a doctor.（对划线部分提问）
                Mr Black         ?