Interrogative sentences are also introduced by interrogative pronouns, adjectives, or adverbs:Who was the last to see Barnwell alive?What bus Is this?Where is it going?When an interrogative adverb is used, as in the last example, the positions of subject and verb are the same as those in questions without the interrogative word. When interrogative pronounsor adjectives are used as subjects or modifiers of subjects, the order is subject-verb- complement, as in declarative sentences; but when they are used as complements or modifiers of complements, the order is complement-auxiliary verb-subject-principal verb:What did you see?What picture did you see ?The interrogative form is sometimes used for exclamations:Did he run !Do I like jelly beans!