Parksie
Perhaps the linguistics fails to capture the necessary logic.
What's the point of formal logic if it fails to capture the intracacies of human language?

Honeybee
If you take the sentence "There is a fire in the room" equal to the sentence "I believe there's a fire in the room", you are actually trying to talk the objective/subjective reality thing here
But that's the point. Are they semantically equivillent or are they different. If they are different then we have a linguistic contradiction which is not recognised by formal logic.