Here a -under construction- explanation about PASSIVE VOICE
- My camera has been stolen.
- The Mona Lisa was painted in 1503.
- We are being followed.
- She was seriously injured in the car crash.
- You will be told when to come.
- The school was built just after the war.
- The ski race has been cancelled due to lack of snow.
- The classrooms are cleaned every afternoon. (present simple)
- A new road is being built behind the school. (present continuous)
- The boy was seen spraying paint on the wall. (past simple)
- I was late because the road was being repaired. (past continuous)
- The car thief has been caught. (present perfect)
- The painting had been damaged during the war. (past perfect)
- You will be shown how to do it. (future)
- It must be done. (modal verb + simple infinitive)
- She likes to be praised when she does well. (infinitive withto)
- I hate being watched when I'm working. (gerund)
The second world war began in September 1939. It was caused by the invasion of Poland by German troops. At this time Poland was governed by the Polish Socialist Party.
The second world war began in September 1939. The invasion of Poland by German troops caused it. The Polish Socialist Party governed Poland at this time.