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4. Interrogative pronounsInterrogative pronouns are used in asking questions. The pronouns who, what andwhich are used as interrogative pronouns.e.g. Who telephoned?What did you say?Which is your brother?a. Direct questionsInterrogative pronouns can be placed at the beginning of a sentence in order to ask aquestion. Such questions can be referred to as direct questions.In a direct question, when the interrogative pronoun is the subject of a verb, the verbfollows the subject. In the following examples, the verbs are underlined, and thesubjects of the verbs are printed in bold type.e.g. What has happened?Who has been invited?In these examples, what is the subject of the verb has happened, and who is thesubject of the verb has been invited. The presence of the interrogative pronountransforms the statement into a question, and a question mark must be used.When the interrogative pronoun is the object of the verb or the object of a preposition,inverted word order must be used, with the first auxiliary preceding the subject of theverb. In the case of verbs in the Simple Present or Simple Past, the auxiliary do or didmust be used.e.g. What do you mean?Which did she choose?What i? he doing?To what can one attribute their success?In the preceding examples, the subjects you, she, he and one are preceded by theauxiliaries do, did, is and can. In the first three examples, what and which are theobjects of the verbs. In the fourth example, what is the object of the preposition to.See Exercise 6.b. The pronoun WhoThe pronoun who usually refers only to persons. Unlike the other interrogativepronouns, who changes its form depending on the case, as shown in the followi ng table.Subjective CasewhoObjective CasewhomPossessive Casewhosei. WhoWhen who is the subject of a verb, the subjective case must be used.e.g. Who opened the door?Who will help me?