1. Raman is watching t.v
---- T.v is being watched by Raman.
2.gourav and seema are cooking food for their mother.
---food is being cooked by gorav and seema for their mother.
3. rohit has bought a book.
--- a book has been bought by rohit.
4. they r laughing at a beggar.
--- a beggar has been laughed at by them.