Direct object and direct object pronouns
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This chapter discusses the past perfect and the pluperfect tenses of basic Portuguese. The past perfect is formed by two verbs: the auxiliary verb ter, conjugated in the imperfect tense, plus the past participle of the main verb. When using pronouns in past perfect sentences reflexive pronouns, direct object pronouns or indirect object pronouns, the pronoun is hyphenated to the auxiliary verb, except when the position of the pronoun is inverted. In literary and historical texts, the verb haver in the imperfect havia, havias, havia, havíamos, haviam, is sometimes used as auxiliary verb to the past perfect, instead of the verb ter. The third person plural of the pluperfect conjugation coincides with that of the preterite, even in irregular verbs. So its use is avoided in order to prevent potential confusion and the past prevent potential confusion and the past perfect is used instead.