Relier Pairs Passive useVersion en ligne Match the uses to the examples par Janssens Joyce 1 Rules are made to be broken. 2 Mistakes were made. 3 The cave paintings of Lascaux were made in the Upper Old Stone age. 4 Insulin was first discovered in 1921 by researchers at the University of Toronto. It is still a treatment available for diabetes. 5 An experimental solar power plant will be built in the Australian desert. The actor is irrelevant. You want to emphasize the person or thing acted on. You want to be vague about who is responsible. You are talking about a general truth. The actor is unknown.