4)
- The article you gave me to read is fascinating.
- This is the discovery that was mentioned by the teacher today .
- The man that he was talking to is a doctor .
- I know the book that was used to prepare the conference .
5)
- This is the magazine i was talking about .
- The Bogdanov twins whose TV program was called " Temps X " , are half russian .
- They are the brothers whose book was published recently .
- Astronomy is the science i dream of .
6)
- .... who ...
- ...... i was telling ....
- .... which ...,
