Zamień zdania na stronę bierną.

1. They have never published his last novel.
2. They send us a new catalogue every three months.
3. They will announce the results next weekend.
4. Someone opened the safe last night.
5. Someone gave Sarah beautiful roses this morning.
6. They will organize a few concerts during the summer.
7. My friends invited me.
8. A tornado destroyed trees last weekend.