1/ I couldn't understand the woman. I talked to her on the phone.
-> I couldn't understand the woman to whom I talked on the phone.
2/ The film is fantastic. They are talking about it.
-> The film which they are talking about is fantastic.
3/ We are speaking to the man. The man was our new history teacher.
-> We are speaking to the man who was our new history teacher.
4/ The teacher is Mr Pike. We studied with him last year.
-> The teacher is Mr Pike with whom we studied last year.
5/ there are some words. They are very difficult to translate.
-> there are some words that are very difficult to translate.
6/ What is the name of the man? you borrowed his car.
-> What is the name of the man whom you borrowed his car?
7/ This watch costs lot of money. I have lost the watch.
-> This watch which I have lost the watch costs lot of money.
8/ We were given a lot of information. Most of the information was useless.
-> We were given a lot of information most of which was useless.​