Подчеркните глагол-сказуемое, определите видовременную форму и залог,укажите инфинитив ,от которого данная форма образована.

1. The exercise was written by the students. 2. The news will be of great interest.3 When I saw him, he was going home.4 The questions were being discussed for 3 hours. 5 The book will Ье given to me Ьу our teacher. 6. They had passed their exams by 3 o'clock yesterday. 7. New phenomena of nature are discovered by people due to electronic devices. 8. We shall be writing our tests at 10 o'clock. 9. A variety of tubes were invented by scientists for specialized functions.

1 written - to write - passive voice - past simple

2 will be - to be - passive voice - future simple

3 saw (him) - to see - active voice - past simple; was going - to go - active - past continious

4 were being discussed - to discuss - passive - past continious

5 will be given - to give - passive - future simple

6 had passed - to pass - active - past perfect 

7 are discovered - to discover - passive - simple present

8 shall be writing - to write - active - future continous

9 were invented - to invent - passive - past simple