Are you at home?: Were you at home?
Why is she late?: Why was she late?
My brother is a doctor: My brother was a doctor.
They aren't here: They weren't here.
Eva is a teacher: Eva was a teacher.
Is Mr. Smith a taxi driver?: Was Mr. Smith a taxi driver?
Where are your books?: Where were your books?
What is it?: What was it?
Sue isn't tired: Sue wasn't tired.
The pen is blue: The pen was blue.
Are you a student?: Were you a student?
My holiday is nice: My holiday was nice.