Natural english

By the way, Julie could sing a song. 
Who could sing a song?   
 
Julie could sing a song.   
 
Could Julie sing a song?   
 
Yes, Julie could sing a song. 
 
 
Could Julie play an instrument?   
No, she could not play an instrument. 
What was she able to do?
She could sing a song. While her friends were working, she 
was singing many songs for them.
Were the rabbits singing many songs? 
No, the rabbits were not singing many songs.
Were the rabbits working?  
 
Yeah, the rabbits were working.   
Was Julie working? 
 
 
 
What was Julie doing? Yes, she was. 
 
 
She was singing songs for the rabbits. 
Was she singing few songs for her friends? 
No, she was not. She was singing many songs for them.