How do you ask questions in Spanish?

In Spanish, questions are phrased and structured a bit differently to what we're used to in English. Questions beginning with "are there" or "do you" in English, for example, are simply written as "there are" and "you do" in Spanish.

e.g.  "Can we eat?" would be "¿Podemos comer?" - (We can eat?)

But how can we tell the difference between a statement and a question?

In writing, question marks indicate a question. In speech however, exaggerate your voice in a way that makes it obvious you are asking a question, usually by making your voice a little more high pitched at the end of the sentence.