Why don't interrogative sentences _start_ with a question mark?

Question

Not all questions start with Wh- words, so why don't we start a question with a question mark to make it more obvious that it *is* actually a question?For instance, when I'm reading a book which has a long interrogative sentence at the bottom of the right-hand page, it often isn't until I turn to the next page that I realize it is a question.Not that this represents too much of a problem, but from a beginner's perspective it must make it harder to interpret the words of the sentence in the correct context.Similarly, why don't we start exclamatory sentences with an exclamation mark?I know this is a trivial question, but I'm wondering whether some kind of historical or colonial/imperial decision might explain the absence of these marks in the situations I describe.P.S. *I am a student programmer, so pardon my ignorance / funniness*

Answer 1

Spanish questions do start with an upside down question mark.

Spanish is relatively easier to learn than English.

Answer 2

You can tell by the tone of a sentence if it's interrogative or not. Therefore, you don't need a question mark to begin the sentence. For example, there is a difference of tone between the sentences of, "Is the sky blue?"and "The sky is blue."