where is the beautiful picture?you bought it last week
Where is the beautiful picture which/that/不填 you bought last week?
she is the tallest girl in her class she can play the violin
She is the tallest girl in her class,who can play the violin.
this is the hall.we listend to the report in it the other day
This is the hall in which we listened to the report the other day.
This is the hall where we listened to the report the other day.
the car was going 90 miles an hour.the car just passed us
The car which just passed us was going 90 miles an hour.
the man waved to us the man was my uncle
The man who waved to us was my uncle.
i enjoyed reading the book you gave me a book last week
I enjoyed reading the book which/that/不填 you gave me last week.
i prefer the subject the subject is science
The subject which/that/不填 I prefer is science.
i spoke to the man the man is a professor
The man who/whom/不填 I spoke to is a professor.