1
What did S do in the main building on the first floor?
Which building did S sleep in? / Where did S sleep?
On what floor did S sleep?
2
What had we done by 7 p.m.?
What had we cleaned by 7 pm?
By what time had we cleaned the plates?
3
Does R have a rider sphere of interest?
4
When was this house built?
In what century was this house built?