Which sentence states a fact?
Bubble gum was first made in 1928. Chewing bubble gum in class is not polite.
A fact is something that can be proved to be true.
The month of July has more days than the month of June.
This is a fact. It can be proved by looking at a calendar and counting the number of days in each month.
An opinion is something that a person believes, thinks, or feels. An opinion cannot be proved true.
July is a better month than June for camping.
This is an opinion. People may have different opinions about which month is "better" for camping.
The second sentence states a fact.
Bubble gum was first made in 1928.
It can be proved by looking up the history of bubble gum.
The first sentence states an opinion.
Chewing bubble gum in class is not polite.
Not polite shows what a person believes, thinks, or feels. Another person might have a different opinion about what is polite.