It is believed that the Mona Lisa was painted by Leonardo da Vinci.
The Mona Lisa is believed to have been painted by Leonardo da Vinci.
The Great Wall of China is known for being the longest wall in the world.
It is known that the Great Wall of China is the longest wall in the world.
It is thought that the pyramids of Giza were constructed over 4,500 years ago.
The pyramids of Giza are thought to have been constructed over 4,500 years ago.
The Eiffel Tower is known for being a symbol of Paris, France.
It is known that the Eiffel Tower is a symbol of Paris, France.
It is believed that the universe is expanding at an accelerating rate.
The universe is believed to be expanding at an accelerating rate.
The Taj Mahal is known for being a symbol of love and devotion.
it is known that the Taj Mahal is a symbol of love and devotion.
It is thought that the first Olympic Games were held in ancient Greece.
The first Olympic Games are thought to have been held in ancient Greece.
The Statue of Liberty is known for being a symbol of freedom and democracy.
It is known that the Statue of Liberty is a symbol of freedom and democracy.
It is believed that the human brain is the most complex organ in the body.
The human brain is believed to be the most complex organ in the body.
The Colosseum in Rome is known for being one of the greatest ancient amphitheaters in the world.
It is known that the Colosseum in Rome is one of the greatest ancient amphitheaters in the world.
The team must be completing the project.
The project must be being completed by the team.
The chef should be baking the cookies.
The cookies should be being baked by the chef.
The mechanic could be repairing the car.
The car could be being repaired by the mechanic.
The maid might be cleaning the house.
The house might be being cleaned by the maid.
The band must be rehearsing the song.
The song must be being rehearsed by the band.
The student should be reading the book.
The book should be being read by the student.
