1. Dark clouds cover the sky in winter.
The sky is covered by dark clouds in winter.
2. We are booking tickets for the concert.
Tickets for the concert are being booked.
3. The newsagent has just sold the magazine,
The magazine has been sold by the newsagent.
4. The family bought the cottage in 2010.
The cottage was bought in 2010.
5. Australians had celebrated the beginning of the New Year when we phoned.
The beginning of the New Year had been celebrated by Australians when we phoned.
6. We will retell the story over and over again.
The story will be retold over and over again.
7. Students must take two exams in autumn.
Two exams must be taken in autumn
8. She has to discuss the matter carefully.
The matter has to be discussed carefully.
9. The gardener is trimming the trees at this time of day
The trees are being trimmed by the gardener at this time of day.
