В этих предложениях определить видовременную форму и залог глагола-сказуемого. Помогите пожалуйста?

1 .They were asked at the last seminar.
2. A new hostel was being built in my street when I came to see my parents.
3. The letter has just been printed.
4. He had been sent for before I came.
5. The steamer will have been unloaded when the agent arrives at the port.