1. This is the man. I met him in Paris
-> This is the man whom I met in Paris
2. I wanted the painting, You bought it
-> I wanted the painting that you bought
3. This is the chair. My parents gave it to me
-> This is the chair that my parents gave to me
4. She’s the woman. She telephoned the police
-> She's the woman who telephoned the police
5. He’s the person. He wanted to buy your house
-> He's the person who wanted to buy your house
