Experts are developing new technologies now., New technologies are being developed (by experts) now., Humans invent new things every day., New things are invented (by humans) every day., The Wright brothers developed the first flying machine in 1904., The first flying machine was developed (by the Wright brothers) in 1904., Were scientists testing a new vaccine against the flu?, Was a new vaccine against the flu being tested (by scientists)?, Cookers have made new condiments lately., New condiments have been made (by cookers) lately., Dr. Shuyler had already invented the electric fan when Carl Benz invented the automobile in 1986., The electric fan had already been invented (by Dr. Shuyler) when Carl Benz invented the automobile., They will develop flying cars soon., Flying cars will be developed (by them) soon., Brazilian scientists are going to explore the Antarctic in December., The Antarctic is going to be explored (by Brazilian scientists) in December., Everybody should study the timeline of historic inventions., The timeline of historic inventions should be studied (by everybody)., Could the inventors have offered a better solution for that complex problem?, Could a better solution for that complex problem have been offered (by the inventors)?

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