Interrogative sentences are generally divided between yes–no questions, which ask whether or not something is the case (and invite an answer of the yes/no type), and wh-questions, which specify the information being asked about using a word like which, who, how, etc.
An intermediate form is the choice question, disjunctive question or alternative question, which presents a number of alternative answers, such as "Do you want tea or coffee?"
Negative questions are formed from negative sentences, as in "Aren't you coming?" and "Why does he not answer?"
Tag questions are questions "tagged" onto the end of sentences to invite confirmation, as in "She left earlier, didn't she?"
Indirect questions (or interrogative content clauses) are subordinate clauses used within sentences to refer to a question (as opposed to direct questions, which are interrogative sentences themselves). An example of an indirect question is where Jack is in the sentence "I wonder where Jack is." Note that English and many other languages do not use inversion in indirect questions, even though they would in the corresponding direct question ("Where is Jack?"), as described in the following section.