Определите Passive Voice с объяснениями. Заранее благодарю!

1. A very popular activity in many families has become sport.
2. Has the postman come today? -Yes, he has just been here, he has brought a letter. Take it. 3. English is spoken in many countries of the world.
4. It is possible than they are completing the experiment at present.
5. When are you going to leave Moscow?
6. This work has been included into our plan.
7. When we left the laboratory some students were still making the experiment.
8. He was asked to show the first-year students the new equipment of the laboratory.
9. You will be sent to test the new system.
10. I knew I was being waited for.
1. We had classes in the morning yesterday, so I had to get up early.
2. They could listen to him for hours though they sometimes doubt whether his stories are true 3. You are to provide the necessary equipment for our laboratory.
4. They should calculate the distance more accutately.
5. The student will be allowed to use the new device.