Which sentence states a fact?
A: Bubble gum was first made in 1928.
B: Chewing bubble gum in class is not polite.
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.