1.I read the book by Agatha Christie.--> Did you read the book by Agatha Christie? I did not read the book by Agatha Christie.
2. He does his best to be a good father.--> Does he do his best to be a good father? He does not do his best to be a good father.
3. We shall get good marks for our work.->Shall we get good marks for our work? We shall not get good marks for our work.
4. They usually spend their holidays in die country.-> Do they usually spend their holidays in die country? They do not usually spend their holidays in die country.
5. She plays the piano well.--> Does she play the piano well? She does not play the piano well.