It's definitely true that in English, most questions use auxiliary verbs (am/is/are or do/does). English loves auxiliary verbs. There are two types of questions (that I can think of) that don't [<-- auxiliary verb] require them. Questions that begin with who/what AND are the subject of the reply sentence. "Who knows the answer?" --> I know the answer. "What happened?" --> Nothing happened. vs "What did you eat?" --> I ate nothing "Where are you going?" I'm going home. Another option is colloquial. The "do" or the "are" can be left off. For example, "Do you understand" --> "Understand?" or "You got it?" and "are you coming?" --> "you coming?".