I had never seen a person __________ could run so fast!
I had never seen a person WHO / THAT could run so fast!
She worked for a man. The man used to be an athlete.
She worked for a man who / that used to be an athlete
The exercise was very complicated. Nobody could do it.
The exercise which / that / - nobody could do was very complicated.
We broke the computer. The computer belonged to my father.
We broke the computer that / which belonged to my father.
The man was arrested yesterday. He escaped from prison a week ago.
The man who / that escaped from prison a week ago was arrested yesterday
They live in a city. The city is in the north of England.
They live in a city which / that is in the north of England.
I really like the car. I bought it last year.
I really like the car that / which / - I bought last year.
That is the man. I spoke to him the other day.
That is the man who / whom / that / - I spoke to the other day
They elected a new mayor. His aim is to help the poor.
They elected a new mayor whose aim is to help the poor.
That casino is the Bellagio, __________ the thieves robbed $3.6 million last year.
That casino is the Bellagio, WHERE the thieves robbed $3.6 million last year.
Mr Black took over the company. His wife died last year.
Mr Black, whose wife died last year, took over the company.
The restaurant is the best in town. We usually eat there.
The restaurant where we usually eat is the best in town.