Which sentence states a fact?
Evergreen trees keep their needles in winter. Trees that have needles are ugly.
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 first sentence states a fact.
Evergreen trees keep their needles in winter.
It can be proved by observing evergreen trees in winter.
The second sentence states an opinion.
Trees that have needles are ugly.
Ugly shows what a person believes, thinks, or feels. Another person might have a different opinion about which trees are ugly.