The relative pronounA part of speech that refers to or stands instead of a noun. E.g.: Who do you think I am? ("you", "I") can be omitted in defining relative clauseA group of related words containing a subject and a verb.s if the pronoun is the objectA person or thing that is affected by the action of a verb or involved in the result of an action. of the clause. We use the phrase zero pronoun to indicate such a case. There are, however, other cases when the clause can be shortened.