Betty is reading some books.（改为一般疑问句）
_Is____ Betty __reading___ _any____ books?
Are they playing football?（作否定回答）
_No___ ,__they aren't___ _____.
She is working.（改为同义句）
She is _on _____ __work____.
My brother is (learning a dragon dance) now.（对括号部分提问）
_What____ __is___ your brother _doing____ now?
What's the meaning of the word?（改为同义句）
What _does____ the word __mean___?
They are playing the piano.（改为否定句）
They _aren't____ _playing____ the piano.
Tom often plays computer games.（用at the moment 改写句子）
Tom _is____ _playing____ computer games at the moment.
His mother is (cooking the meal).（对括号部分提问）
_What____ __is___ his mother _doing____?
They are having a good trip.（改为同义句）
They are _enjoying____ the trip.
They are dancing (in the classroom).（对括号部分提问）
_Where_____ __are____ they dancing?