We have already been here for three days.1 Have we already been here for three days?
2 Have we already been here for three or five days?
3 Who has already been here for three days
4 We have already been here for three days, haven't we?
5 How long have we already been here?
We toured Buckingham Palace1 Did we tour Buckingham Palace?
2 Did we tour Buckingham Palace or the Tower of London?
3 Who toured Buckingham Palace?
4 We toured Buckingham Palace, didn't we?
5 What did we tour?