1.The boy is my younger brother.He was here a minute ago.
The boy who is my younger brother was here a minute ago.
2.The old man is a professor.He teaches chemistry in a college.
The old man who teaches chemistry is a professor.
3.Beijing Hotel is near Tian An Men Square.The foreign visitors live there.
Beijing Hotel where the foreign visitors live is near Tian An Men Square.
4.The woman is here now.You were talking about her.
The woman you were talking about is here now.
5.This is the hall.We listened to the report in it the other day.
This is the hall where we listened to the report the other day.
6.the car was going 90 miles an hour.The car just passed us.
The car that just passed us was going 90 minles an hour.
7.The man was my uncle.The man waved to us.
The man who waved to us was my uncle.
8.I enjoyed reading the book.You gave me a book last week.
I enjoyed reading the book that you gave me last week.
9.I prefer the subject.The subject is science.
The subject I prefer is science.
10.I spoke to the man.The man is a professor.
The man I spoke to is a professor.