Many “yes/no” questions are formed with the verb “do” before the subject and the main verb after.
Questions with helping verbs reverse the order of the subject and the helping verb.
Tag questions start with a sentence and finish with a brief question (usually just a verb and a subject).
Sometimes doubt or uncertainty can be indicated by a simple statement ending in a question mark. (In actual speech, the voice goes up at the end.)
Questions that seek information
Information-seeking questions often begin with question words: “who,” “what,” “when,” “where,” “why,” “how,” or “how” plus an adjective.
An embedded or indirect question begins with a phrase implying a request.