1.I have written a letter today.
What have I /you written?
I haven't written a book.
2. Mary has been upset.
She has not been happy.
Who has been upset?
3. The school has opened the doors for its pupils.
The school has not opened the doors ...
Whom has the school opened its doors for?
4. They have read the morning newspaper.
What have they read?
They haven't read the weekly newspaper.