1. They are painting the living room at the moment.
⇒ The living room is being painted at the moment.
2. John drives more carefully than his brother does.
⇒ John's brother doesn't drive as carefully as he does
3. Learning English is not easy
⇒ It is difficult to learn English
4. They were such difficult questions that we couldn't answer all of them.
⇒ The questions were so difficult questions that we can't answer
5. I don't know her phone number, so I can't call her
⇒ If I know her phone number, I will call her.
6. Don't let the children stay up too late.
⇒ They don't allowed the children stay up late
7. My sister is not old enough to ride a bicycle. (too)
⇒ My sister is too young to ride a bicycle.
8. She is mean and bad-tempered. (but)
⇒ She is not only mean but also bad-tempered
9. We had to do a lot of homework at school. (made)
⇒ We were made to do a lot of homework at school
10. Although he was ill, he managed to get the job done in time.
⇒ In spite of his illness, he managed to come to school.
14. We spent nearly a week making these toys. (took)
⇒ It took us nearly a week to make these toys.
15. Peter isn't trying to solve his financial problems. (effort)
⇒ Peter isn't giving the effort to solve his financial problems
16. The doctor gave him a warning not to smoke because it's dangerous. (warned)
⇒ The doctor warned that smoking is very dangerous
17. In her eyes, all her classmates are not trustworthy. (thinks)
⇒She thinks all of her friends are unreliable
18. She was grateful to them for their hospitality. (thanked)
⇒She thanked them for their hospitality.
19. He didn't want to participate in the volunteers' activities. (take)
⇒ He does not want to take participate in volunteer activities.
20. They didn't let him get in the disco because he was under . (prevented)
⇒ They prevented him from entering the disco because he was below.