People
A woman works at the local hospital. She treated my brother.
The woman who works at the local hospital treated my brother.
I bought a laptop. It was on sale.
I bought a laptop which/that was on sale.
This is the town. I grew up there.
This is the town where I grew up.
The afternoon was unforgettable. We met a famous actor then.
I don't understand the reason. He was so angry because of it.
I don't understand the reason (why) he was so angry.
My next-door neighbour is moving away. He has lived here for 40 years.
My next-door neighbour, who has lived here for almost 40 years, is moving away.
The film was disappointing. We watched it last night.
"The film which/that we watched last night was disappointing"
OR 'The film we watched last night was disappointing"
The restaurant serves excellent seafood. We had dinner there.
The restaurant where/in which we had dinner serves excellent seafood
2008 was the year. The financial crisis began then.
2008 was the year when the financial crisis began.
Can you explain the reason? The meeting was cancelled because of it.
Can you explain the reason why the meeting was cancelled?
The actor won an award. We met him last year.
"The actor we met last year won an award"
OR "The actor who/whom we met last year won an award"
The recipe turned out delicious. You sent it to me.
"The recipe you sent me turned out delicious"
OR "The recipe which/that you sent me turned out delicious"
Paris attracts millions of tourists every year. I spent my vacation there last summer.
Paris, where I spent my vacation last summer, attracts millions of tourists every year.
Do you remember the day? We first met then.
Do you remember the day when we first met?
Historians still debate the motives. The king started the war because of them.
Historians still debate the motives why the king started the war.
I know a man. His daughter is an astronaut.
I know a man whose daughter is an astronaut.
The sculpture was damaged during transport. It is worth millions of dollars.
The sculpture, which is worth millions of dollars, was damaged during transport.
I used to work at a restaurant. It has closed.
"The restaurant I used to work at has closed"
OR
"The restaurant which/that I used to work at has closed"
OR
"The restaurant where I used to work has closed"
note: don't use the preposition with "where"
The decade brought enormous technological change. I was born during it.
"The decade I was born in brought enormous technological change."
OR "The decade in which I was born brought enormous technological change"
The government cited economic difficulties. The project was postponed because of them.
The government cited economic difficulties, for which the project was postponed.
I sent my friend a text almost a week ago. She has finally answered me.
My friend to whom I sent a text almost a week ago has finally answered me.
No one had done their homework, which made the teacher upset.
The village has become a centre for artists and writers. Few people had heard of it twenty years ago.
The village, which few people had of twenty years ago, has become a centre for artists and writers.
The recession affected millions of people. Unemployment rose sharply during it.
The recession, during which unemployment rose sharply, affected millions of people.
The report outlined several factors. The company had failed because of them.
The report outlined several factors for which the company had failed.
OR The report outlined several factors because of which the company had failed.