Present active voice: Historians study ancient civilizations., Researchers investigate new medical treatments., Engineers design innovative technologies., Scientists conduct experiments in laboratories., Architects create modern buildings., Teachers educate students in classrooms., Conservationists protect endangered species., Artists paint beautiful murals., Journalists write news articles., Musicians compose new songs., Past active voice: Columbus discovered America in 1492., The Wright brothers invented the airplane in 1903., Leonardo da Vinci painted the Mona Lisa in the early 16th century., Neil Armstrong and Buzz Aldrin walked on the moon in 1969., The Allies defeated the Axis powers in World War II., Alexander Graham Bell invented the telephone in 1876., Scientists developed the polio vaccine in the 1950s., Gutenberg invented the printing press around 1440., The Romans built the Colosseum between 70 and 80 AD., The Egyptians constructed the Great Pyramid of Giza around 2560 BC.,

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