Oblique pronouns substitute or refer back to entities already mentioned and perform the functions of direct object, indirect object, or prepositional complement. Among them, the unstressed forms attach to the verb with a clitic value, and the stressed forms appear after a preposition. Understanding these functions is decisive for recognizing how the sentence distributes the relations between the verb, the complement, and the nominal reference, in dialogue with the general class of Pronouns.

The unstressed forms me, te, se, o, a, nos, vos, os and as accompany the verb without their own accent and typically mark direct or indirect object as required by the verb. The forms o, a, os and as agree in gender and number with the antecedent, while me, te, se, nos and vos do not vary. In constructions with complements, the use of o and a distinguishes direct resumption, whereas lhe and lhes indicate indirect resumption.

IdeiaIdea	ExemploExample
me retoma a primeira pessoa como complemento átono.me refers back to the first person as an unstressed complement.	Vi me no espelho.I saw myself in the mirror.
o retoma um antecedente masculino singular como objeto direto.o refers back to a masculine singular antecedent as the direct object.	Encontrei o livro e li o.I found the book and read it.
as concorda com um antecedente feminino plural.as agrees with a feminine plural antecedent.	Chamei as estudantes e ouvi as.I called the students and heard them.
lhe marca complemento indireto e não varia em número ou gênero.lhe marks indirect object and does not vary in number or gender.	Dei lhe atenção na reunião.I gave him/her attention at the meeting.

The tonic forms mim, ti, si, nós and vós always appear after a preposition and do not function as verbal clitics. They are used when the pronoun is integrated into a prepositional term, as in para mim or entre nós. The form si requires reflexive value or generic reference, and the choice depends on the syntactic relation established by the preposition, as occurs in other uses of Personal Pronouns.

IdeiaIdea	ExemploExample
mim ocorre após preposição.mim occurs after a preposition.	Trouxe o presente para mim.I brought the gift for me.
ti ocorre após preposição.ti occurs after a preposition.	Guardei a carta para ti.I kept the letter for you.
si exige contexto preposicionado.si requires contextual prepositional usage.	Falou de si com calma.He spoke of himself calmly.
nós aparece em grupo preposicionado.nós appears in a prepositional group.	Vieram com nós para casa.They came with us to the house.

The position of oblique pronouns depends on the syntactic context, and the same form can appear before, after, or inside the verb depending on the construction. In formal standard language, proclisis places the pronoun before the verb, enclisis places it after the verb, and mesoclisis inserts it into the future indicative. In Brazilian Portuguese, proclisis is very common in speech, while in Portugal enclisis is more common in formal writing.

IdeiaIdea	ExemploExample
próclise antecipa o pronome ao verbo.proclisis places the pronoun before the verb.	Não me diga isso.Don't tell me that.
ênclise posiciona o pronome depois do verbo.enclisis places the pronoun after the verb.	Diga me depois.Tell me later.
mesóclise insere o pronome no futuro do indicativo.mesoclisis inserts the pronoun in the future indicative.	Dar te ei amanhã.I shall give you tomorrow.
a norma varia conforme o registro e a variedade.the standard varies according to register and variety.	Falou me ontem com naturalidade.You spoke to me yesterday with natural ease.

Negative words, adverbs, relative pronouns and certain conjunctions attract the pronoun before the verb, favoring proclisis. Therefore, never saw me, perhaps call me, and the book that they gave me follow the same attraction principle. This behavior is central to understanding placement in Portuguese, especially when comparing uses closer to formal writing with those of everyday speech, as also seen in Relative Pronouns.

IdeiaIdea	ExemploExample
palavra negativa favorece próclise.negative word favors proclisis.	Nunca me viu.Never saw me.
advérbio favorece próclise.adverb favors proclisis.	Talvez me chame mais tarde.Perhaps call me later.
pronome relativo favorece próclise.relative pronoun favors proclisis.	O aluno que me falou saiu.The student who spoke to me left.
conjunção atrativa favorece próclise.conjunction attracting favors proclisis.	Quando me vir, avise.When you see me, let me know.

Enclisis is favored when the verb begins the sentence or appears after a pause, which makes it very common in formal registers. It also arises with infinitives and other structures where the verb appears without a preceding attracting element, especially in careful writing. The choice between enclisis and proclisis varies with regional tradition and level of formality, and this contrast is strong in contexts close to Reflexive Pronouns.

IdeiaIdea	ExampleExample
início de oração favorece ênclise.beginning of sentence favors enclisis.	Disse me a verdade.Tell me the truth.
pausa favorece ênclise.pause favors enclisis.	Depois, fale me com calma.Then tell me calmly.
infinitivo admite ênclise formal.infinitive allows formal enclisis.	É melhor explicar lhe tudo.It is better to explain to him everything.
registro culto favorece essa colocação.formal register favors this placement.	Respondeu me com precisão.He answered me with precision.

Mesoclisis occurs with verbs in the future of the present and in the future of the past, when there is no element attracting the pronoun to before the verb. It is characteristic of formal standard usage and appears almost never in everyday speech, though it remains alive in administrative, literary and solemn texts. When there is an attracting word before the verb, mesoclisis disappears and proclisis becomes required.

IdeiaIdea	ExemploExample
futuro do presente admite mesóclise.future of the present allows mesoclisis.	Dar te ei apoio amanhã.I shall give you support tomorrow.
futuro do pretérito admite mesóclise.future of the past allows mesoclisis.	Dir te ia a verdade.I would tell you the truth.
texto formal favorece essa forma.formal text favors this form.	Conceder vos ei prazo extra.I shall grant you extra time.
palavra atrativa impede mesóclise.an attracting word prevents mesoclisis.	Nunca te direi isso.Never will I tell you this.

The pronouns o, a, os and as take the direct object, while lhe and lhes take the indirect object. This distinction helps choose the correct form according to the verb’s governance, especially when the antecedent is a nominal phrase already known in discourse. In structures with verbs and complements, analyzing governance is as important as agreement of form, a topic related to the study of Treatment Pronouns.

IdeiaIdea	ExemploExample
o marca objeto direto masculino singular.o marks direct object masculine singular.	Vi o rapaz e cumprimentei o.I saw the boy and greeted him.
a marca objeto direto feminino singular.a marks direct object feminine singular.	Conheci a professora e respeitei a.I met the teacher and respected her.
lhe marca objeto indireto singular.lhe marks indirect object singular.	Entreguei lhe a carta.I gave him the letter.
lhes marca objeto indireto plural.lhes marks indirect object plural.	Mostrei lhes os documentos.I showed them the documents.

The reflexive pronouns se and si indicate that the action falls back on the subject itself, and their placement follows the same rules as the other oblique pronouns. In reflexive constructions, interpretation depends on the relation between subject and complement, which also appears in broader uses of Reflexive Pronouns. When the structure requires a preposition, si substitutes the unstressed forms and maintains the reference back to the same referent.

IdeiaIdea	ExemploExample
se indica ação voltada ao sujeito.se indicates an action directed at the subject.	Ele se feriu na queda.He injured himself in the fall.
si aparece em contexto preposicionado.si appears in a prepositional context.	Falou de si com sinceridade.He spoke of himself calmly.
colocação reflexiva segue as regras gerais.reflexive placement follows general rules.	Não se esqueceu do compromisso.They did not forget about the commitment.
reflexividade depende do sujeito.reflexivity depends on the subject.	A criança se olhou no espelho.The child looked at himself in the mirror.

In verbal phrases and compound tenses, the pronoun can join to the infinitive, to the participle, or to the main verb, depending on the structure and regional usage. In Brazilian Portuguese, forms like vou fazê-lo or estou lhe escrevendo are common, while the formal writing of Portugal often prefers other arrangements. The interpretation depends on the syntactic relation between the pronoun and the verbal nucleus that it accompanies, a useful aspect also for those studying Demonstrative Pronouns in complex sequences.

IdeiaIdea	ExemploExample
pronome ligado ao infinitivo.pronoun linked to the infinitive.	Vou fazê lo amanhã.I will do it tomorrow.
pronome ligado ao verbo principal.pronoun linked to the main verb.	Estou lhe contando tudo.I am telling you everything.
variação regional afeta a colocação.regional variation affects placement.	Vou falar lhe depois.I will tell you later.
tempo composto exige atenção à estrutura.compound tense requires attention to structure.	Tinha me avisado cedo.You had warned me earlier.

Oblique pronouns organize the resumption of references and the relation between the verb and its complements through unstressed and stressed forms. The choice among me, te, se, o, a, nos, vos, os, as, lhe and lhes depends on governance, agreement, and placement, while mim, ti, si, nós and vós appear after a preposition. Proclisis, enclisis and mesoclisis distribute these forms in the utterance according to the presence of attractors, the verb tense and the register, consolidating the functioning of the Portuguese pronominal system.