Jeszcze to :
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Non-Restrictive Clauses (Non-Defining Clauses)
For People
The President of the United States, who is visiting Moscow, claimed that relations between the two countries were at their best for twenty years.
NB - you cannot use that here (after a comma).
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For Things
The intermission, which lasts for fifteen minutes, comes halfway through the film.
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Restrictive Clauses (Defining Clauses)
For People
The man that stole my car was fined. (this is used in American and British English)
The man who stole my car was fined. (this is used in British English)!!!!!!!
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For Things
The company that made it has gone bankrupt.
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Wychodzi, ze w Brytyjskim moze jest tak jak mowisz WHO, ale Amerykanie widocznie w tym nie gustuja :)))))))