Yes/no questions are questions that can be answered with a simple yes or no response. They typically use forms of to be such as is, are, was, or were, or auxiliary/helping verbs like do, does, did, can, may, should, must, might, could, will, or shall. In spoken English, yes/no questions are sometimes shortened by omitting the auxiliary verb or subject. Either way, a question mark is used to indicate it is a question. Examples of full and shortened yes/no questions are provided.