"Dog." "Dog!" "Dog?" We know the first is a statement. The second a warning maybe. And the third a question.
Like facial expressions for emotions. Are there universal human facial expressions or voice modulations that show when we are asking a question? Or naming something. Or giving a warning. I imagine being able to distinguish these 3 things would be quite important for our ape-like ancestors.
In fact, do we share these with apes? When we try and teach apes words do we use things like pointing and intonation? Can they understand this?