The document discusses question formation in English. It explains that wh-questions begin with interrogative words like what, who, when, why and are used to request information. It provides rules for forming wh-questions based on whether the original sentence contains an auxiliary verb or not. For sentences with auxiliary verbs, the subject and verb are inverted. For sentences without auxiliary verbs, the main verb is changed to its base form and the auxiliary "do" is added before inverting the subject and verb. Examples are provided to illustrate these rules.