It is said that practicing sports is healthy and necessary/ Practicing sports is said to be healthy and necessary.

It has been shown that the Antarctica is one of the coldest places in the planet./ The Antarctica has been shown to be one of the coldest places in the planet.

It is said that children are afraid of the dark/Kids are said to be afraid of the dark.

It is said that women live longer than men/women are said to live longer than men.

It has been known that music is part of culture/Music has been known to be part of culture.

It is thought that british people love fish and fries./ british people are thought to love fish and fries.

It has been proven that Gabriel García Marquez was very important for Latin American literature/ Gabo has been proven to be very important for Latin American l

It has been shown that frogs help to keep insects under control. /Frogs have been shown to help to keep insects under control.

It is known that Scientists find the cure for different diseases./ Scientists are known to find the cure for different diseases.

It is thought that the Monalisa is the most famous piece of art. The monalisa is thought to be the most famous piece of art.

It is known that the Amazon is the mightiest river. The Amazon is known to be the mightiest river.