1. They believe that Jim is going to study abroad

->Jim is believed to be going to study abroad

->It is believed that Jim is going to study abroad.

2. People rumored that there was a ghost in that house

->It was rumored that there was a ghost in that house

->A ghost was rumored to have been in that

3. Someone said that Jane would able to win the contest

->It was said that Jane would be able to win the contest.

->Jane was said to be able to win the contest

4. They claimed that everything they said was true

->It was claimed that everything they said was true

->Everything they said was claimed to have been true 

5. They reported that there was a serious accident on the main road

->it was reported that there was a serious accident on the main road

->A serious accident was reported to have happened on the main road.

6. They don’t think that this camera costs that much

->It isn't thought that this camera costs that much.

->This camera isn't thought to cost that much

7. Did they claim that they had managed to solve the problem?

->Were they claimed to have managed to solve the problem?

->Was it claimed that they had managed to solve the problem

8. People didn’t expect that the building collapsed after the storm

->The building wasn't expected to be collapsed after the storm

-> It wasn't expected that the building collapsed after the storm

 S + was/ were + V3 (+ by Sb/O)

 S+ was/ were +  being + V3 (+ by Sb/O)

 S + had + been + V3 (+ by Sb/O)