Помогите пожалуйста с английским.. 20 предложений с актива поставить в пассив. Помогите кто что знает, хоть парочку

1. Do people speak all over the world? - is english spoken all over the world? (тут наверно english пропущено, иначе хз о чем это вообще)
2. Somebody built this house in 1500. - This house was built in 1500.
3. You must answer all the question on the paper. - All the questions on the paper must be answered.
4. Must I answer all the question? - Must all the questions be answered?
5. They blamed me for something i hadn't done. - I was blamed for smth i hadn't done.
6. Someone printed this book in London. - This book was printed in London.
7. Did someone print this book in London? - Was this book printed in London?
8. The teacher gave him a pen. - He was given a pen by a teacher.
9. We sent for the doctor. - The doctor was sent for (???), the doctor was called
10 .Everyone looked at the girl. - The girl was looked at
11. People speak a lot about this film. - This film is spoken about a lot
12. The boys made fun of him. - He was made fun of by the boys
13. He showed me the way to the new laboratory. - The way to the new lab was shown by him
14. They promised her interesting job. - Interesting job was promised to her
15. She offered me a cup of tea. - A cup of tea was offered to me
16. THEY LOOK AFTER THE CHILDREN. - the children are looked after
17. THEY GAVE an actress a bunch of flowers. - an actress was given a bunch of flowers
18. She often asks silly questions. silly questions are often asked by her
19. people don't discuss such things in public. - such things are not discussed in public
20. Students often make mistakes. - mistakes are often made by students.
как-то так

объясни что такое актив и пассив