1.Thecatchasedthemouse.->Themousewaschasedbythecat.
2.Shewillbakeacakeforherbirthday.->Acakewillbebakedbyherforherbirthday.
3.Johnsingsabeautifulmelody.->AbeautifulmelodyissungbyJohn.
4.Theycookeddinnertogether.->Dinnerwascookedtogetherbythem.
5.Thestormdestroyedmanyhomes.->Manyhomesweredestroyedbythestorm.
6.Theteacherpraisedthestudentsfortheirhardwork.->Thestudentswerepraisedbytheteacherfortheirhardwork.
7.Hewrotealettertohisfriend.->Aletterwaswrittentohisfriendbyhim.
8.Robinplayedthepianointheconcert.->ThepianowasplayedintheconcertbyRobin.