Make the sentences passive: 1. The cleaner cleans the office every day. 2. They don't send emails. 3.Does she cut the grass? 4.My friend prefers chocolate. 5.He often steals cars. 6.My brothers play loud music. 7. My mother speaks English. 8.My uncle loves the London parks. 9. The company wants staff. 10. Journalists write articles. 11.Peter loves Julie. 12.My sister doesn't read a lot of books. 13.My mother doesn't cook dinner every day. 14.Milkman delivers milk in the mornings. 15.They don't buy flowers for the flat. 16.My neighbours don't wash the car every week. 17.The policeman writes a report every Friday. 18.They don't fix the roads in our country. 19. Our friends don't build new houses every year. 20.The famer sells vegetables in the market.​

1. The office is cleaned every day by the cleaner.
- The sentence is made passive by starting with the object (the office) and then adding the verb in its passive form (is cleaned) followed by the doer of the action (by the cleaner).

2. Emails are not sent by them.
- The sentence is made passive by starting with the object (emails) and then adding the verb in its passive form (are not sent) followed by the doer of the action (by them).

3. Is the grass cut by her?
- The sentence is made passive by starting with the object (the grass) and then adding the verb in its passive form (is cut) followed by the doer of the action (by her). The word order changes to form a question.

4. Chocolate is preferred by my friend.
- The sentence is made passive by starting with the object (chocolate) and then adding the verb in its passive form (is preferred) followed by the doer of the action (by my friend).

5. Cars are often stolen by him.
- The sentence is made passive by starting with the object (cars) and then adding the verb in its passive form (are stolen) followed by the doer of the action (by him).

6. Loud music is played by my brothers.
- The sentence is made passive by starting with the object (loud music) and then adding the verb in its passive form (is played) followed by the doer of the action (by my brothers).

7. English is spoken by my mother.
- The sentence is made passive by starting with the object (English) and then adding the verb in its passive form (is spoken) followed by the doer of the action (by my mother).

8. The London parks are loved by my uncle.
- The sentence is made passive by starting with the object (the London parks) and then adding the verb in its passive form (are loved) followed by the doer of the action (by my uncle).

9. Staff is wanted by the company.
- The sentence is made passive by starting with the object (staff) and then adding the verb in its passive form (is wanted) followed by the doer of the action (by the company).

10. Articles are written by journalists.
- The sentence is made passive by starting with the object (articles) and then adding the verb in its passive form (are written) followed by the doer of the action (by journalists).

11. Julie is loved by Peter.
- The sentence is made passive by starting with the object (Julie) and then adding the verb in its passive form (is loved) followed by the doer of the action (by Peter).

12. A lot of books are not read by my sister.
- The sentence is made passive by starting with the object (a lot of books) and then adding the verb in its passive form (are not read) followed by the doer of the action (by my sister).

13. Dinner is not cooked every day by my mother.
- The sentence is made passive by starting with the object (dinner) and then adding the verb in its passive form (is not cooked) followed by the doer of the action (by my mother).

14. Milk is delivered in the mornings by the milkman.
- The sentence is made passive by starting with the object (milk) and then adding the verb in its passive form (is delivered) followed by the doer of the action (by the milkman).

15. Flowers for the flat are not bought by them.
- The sentence is made passive by starting with the object (flowers for the flat) and then adding the verb in its passive form (are not bought) followed by the doer of the action (by them).

16. The car is not washed every week by my neighbors.
- The sentence is made passive by starting with the object (the car) and then adding the verb in its passive form (is not washed) followed by the doer of the action (by my neighbors).

17. A report is written every Friday by the policeman.
- The sentence is made passive by starting with the object (a report) and then adding the verb in its passive form (is written) followed by the doer of the action (by the policeman).

18. The roads are not fixed in our country.
- The sentence is made passive by starting with the object (the roads) and then adding the verb in its passive form (are not fixed) followed by the doer of the action (in our country).

19. New houses are not built every year by our friends.
- The sentence is made passive by starting with the object (new houses) and then adding the verb in its passive form (are not built) followed by the doer of the action (by our friends).

20. Vegetables are sold in the market by the farmer.
- The sentence is made passive by starting with the object (vegetables) and then adding the verb in its passive form (are sold) followed by the doer of the action (by the farmer).

By transforming the sentences into the passive voice, the focus of the sentence shifts from the doer of the action to the receiver of the action (the object). This can be helpful in emphasizing the object or when the doer is unknown or less important.