Which sentence states a fact?
A: A plain omelet takes one or two minutes to cook on top of a stove.
B: An omelet is worth the effort needed to make it.
The first sentence states a fact.
A plain omelet takes one or two minutes to cook on top of a stove.
It can be proved by looking up instructions for making an omelet.
The second sentence states an opinion.
An omelet is worth the effort needed to make it.
Worth the effort shows what a person believes, thinks, or feels. Another person might have a different opinion about whether an omelet is worth the effort.