Предложения строятся по схеме: Подлежащее + have/has + причастие прошедшего времени (V3) + ...
Ответ: 1. Have you ever flown by plane?; 2. She has just come back from her trip.; 3. We have not visited them for a long time.; 4. I have not seen the Taj Mahal yet.; 5. Have you been to Australia?; 6. Tom has already made a reservation.; 7. Tina has not checked in yet.