How to Form Polar Questions in Navajo

Navajo has a bewildering array of combinations for questions, one of which is just to add the word maybe to the end of the sentence. Special conjugation on the verb might be able to show if it's the yes or no question or just a tone of voice. I heard that there's difference between United States and Britain, uh, England, British, uh, pronunciation on that int, intonation.