Решение:
- Have you locked the door yet?
- Has she taken the key yet?
- Has he been there yet?
- Have you sent the email yet?
- Have they seen the birds yet?
- Have you had lunch yet?
- Has he finished the project yet?
- Have you seen the window yet?
- Has your classmate closed the door yet?
Ответ: he; you; they; you; he; you; your classmate.