1) Where has she been?
2) What had he done before his account?
3) Who will have finished an income statement by next year?
4) Where will they have come before you return from the office?
When will they have come to your house?
5) What have they started this Monday?
Who have started their work this Monday?
When have they started their work?
6) What had existed before Man appeared?
When had dinosaurs existed?