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      registered at hotels under their real name    start learning
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      Who/that are registered at hotels under their real name   
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      trying to take their pictures    start learning
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      Who/that are trying to take their pictures   
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     start learning
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      Who/that are taking selfies   
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     start learning
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      which/that involve wordplay   
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      married in 2000 but divorced five years later    start learning
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      who were/got married in 2000 but were/got divorced five years later   
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     start learning
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      which/that was used by George Clooney.   
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      Which two verb forms can a participle clause begin with?    start learning
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      present participle (-ing form) or past participle   
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      Names which involve wordplay are common / Names involving wordplay are common    start learning
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      Names involving wordplay are common   
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      The people who worked in the hotel thought the name was funny. / The people working in the hotel thought the name was funny.    start learning
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      The people working in the hotel thought the name was funny.   
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      the hotel, which was built in the 1980s and which is often used by film stars, is famous. / The hotel, built in the 1980s and regularly used by film stars, is famous.    start learning
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      The hotel, built in the 1980s and regularly used by film stars, is famous.   
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      When a relative clause has an active verb in the present simple or past simple,    start learning
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      the participle clause uses a present participle.   
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      When a relative clause has a passive verb in the present simple or past simple,    start learning
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      the participle clause uses a past participle.   
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      Try to improve this sentence by using a participle clause. I couldn't concentarte on the concert because there were so many people who took photos.     Using participle clauses can improve the level of your writing and speaking.   start learning
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      I couldn't concentrate on the concert because so many people were taking photos.   
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      People who take photos should ask their subjects' permission first.    start learning
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      People taking photos should ask their subjects' permission first.   
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      Films that are based on books are disappointing.    start learning
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      Films based on books are disappointing.   
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      It's great to see rock stars in their sixties who still play concerts.    start learning
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      It's great to see rock stars in their sixties still playing concerts.   
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      Architecture which was designed in the 1960s is generally quite ugly and ought to be pulled down.    start learning
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      Architecture designed in the 1960s is generally quite ugly and ought to be pulled down.   
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      Photos of people who are posing for the camera don't work as well as spontaneous pictures.    start learning
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      Photos of people posing for the camera don't work as well as spontaneous pictures.   
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      Film and TV stars who appear at the theatre attract huge audiences.    start learning
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      Film and TV stars appearing at the theatre attract huge audiences.   
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      Jokes which involve racial stereotypes are not funny.    start learning
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      Jokes involving racial stereotypes are not funny.   
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      Photographers who used software to enhance their photos were justifiably banned from entering a national competition last month.    start learning
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      Photographers using software to enhance their photos were justifiably banned from entering a national competition last month.   
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