Which sentence states a fact?
The Great Sphinx is the most interesting Egyptian landmark. The Great Sphinx was built more than 4,500 years ago and is located in Egypt.
A fact is something that can be proved true by research or observation.
George Washington became president of the United States in 1789.
This statement is a fact. It can be proved by researching what year George Washington was inaugurated president.
An opinion is something that a person believes, thinks, or feels. An opinion can be supported by evidence, but it cannot be proved true.
George Washington was a better president than Thomas Jefferson.
This statement is an opinion. People can have different ideas about what makes someone a "better" president, so the statement cannot be proved.
The second sentence states a fact.
The Great Sphinx was built more than 4,500 years ago and is located in Egypt.
It can be proved by reading a history book about the Great Sphinx.
The first sentence states an opinion.
The Great Sphinx is the most interesting Egyptian landmark.
Most interesting shows what a person believes, thinks, or feels. Another person might have a different opinion about what makes one landmark more interesting than others.