Change active into passive voice. 1. columb us discovered america. 2. someone is helping her with her work 3. the queen will open the museum 4. they built the church in the 15th centure 5. the postman clelivers letters in the morning 6. they speak english in australia 7. someone has broken the vase 8. he is writing a book now 9. you may open the window 10. popov invented radio

America was discovered by Columbus.
She is being helped with the work by someone
The museum will be opened by the Queen.
The church was built in the 15th century.
Letters is delivered by the postman in morning.
English is spoken in Australia.
The case was broken by someone.
The book is being written now by him.
The window is might be opened.
The radio was invented by Popov.