Change these sentences into the passive voice

IV. Change these sentences into the passive voice.
1.      Mr. Smith has taught us French for two years.
2.      They didn’t look after the children properly.
3.      Nobody swept this street last week.
4.      People drink a great deal of tea in England.
5.      People speak English all over the world.
6.      Tom was writing two poems.
7.      She often takes her dog for a walk.
8.      How many lessons are you going to learn next month?
9.      She didn’t introduce me to her mother.
10. Someone had invented the electric light before I was born.
11. Farmers usually milk cows twice a day.
12. He likes people to call him “sir”.
13. People know that Japan produces a wide range of cars.
14. Our teacher used to bid us talk in class.
15. People say that he was the richest man in this commune five years ago.