Introduction
Understanding how to express interest in Portuguese can be confusing for English speakers because different verbs and structures are used. This article explains the difference between interessar a and interessar-se por, shows when to use each structure, and gives clear Brazilian Portuguese examples to help you sound natural.
- Overview: two ways to express interest
- Interessar a: object that interests someone
- Interessar-se por: the person shows interest
- Comparing both structures with parallel examples
- Pronoun placement and clitic rules
- Tense and aspect: talking about becoming interested
- Special cases and colloquial alternatives
- Common mistakes and how to avoid them
- Cultural and usage notes
- Quick reference summary
- Conclusion
Overview: two ways to express interest
Portuguese has two common constructions that translate to be interested or to interest. They are interessar a and interessar-se por. Although both relate to the idea of interest, they are not interchangeable in every context. One structure focuses on what causes interest (an impersonal perspective), while the other focuses on the person who feels interest (a reflexive personal perspective).
Interessar a: object that interests someone
Interessar a is used to indicate that something or someone is interesting to another person. Grammatically, the thing that causes interest is the subject of the sentence, and the person who feels interest is an indirect object, typically introduced without a preposition or with the preposition a before a pronoun or noun.
Structure and basic rule
Structure: [subject that interests] + interessar + a + [person affected as indirect object].
In this construction the verb is conjugated to agree with the subject (the thing that interests), not with the person who is interested.
Examples in Brazilian Portuguese
O filme interessa a muitas pessoas.
Meaning: The movie interests many people.
A música clássica interessa a meus avós.
Meaning: Classical music is of interest to my grandparents.
Esse livro não interessa a ninguém.
Meaning: That book does not interest anyone.
Common pronouns and word order
When using pronouns, the indirect object is usually me, te, lhe, nos, vos, lhes. In spoken Brazilian Portuguese lhe and lhes are less common; people often use para mim, para você, etc., for clarity.
Examples:
A notícia me interessa. (Literally: The news interests me.)
Essa série nos interessa. (Literally: This series interests us.)
If you want to emphasize the person, you can use a disjunctive pronoun after the verb with a preposition: Isso interessa a mim? is grammatically possible but sounds formal; more natural is Isso me interessa or Isso interessa para mim.
Interessar-se por: the person shows interest
Interessar-se por is the reflexive structure that puts the focus on the person who is interested. It is often used when you want to say that someone takes an interest in something, becomes interested, or has an interest in a topic or activity.
Structure and basic rule
Structure: [person] + interessar-se + por + [thing or activity].
Here the reflexive clitic (me, te, se, nos, vos, se) refers to the person who is interested, and the verb is conjugated to agree with that reflexive form. The preposition por introduces the object of interest.
Examples in Brazilian Portuguese
Eu me interesso por fotografia.
Meaning: I am interested in photography.
Ela se interessa por história do Brasil.
Meaning: She is interested in Brazilian history.
Você se interessou por aquele curso?
Meaning: Did you become interested in that course?
Differences in nuance
Interessar-se por often implies a personal attraction, curiosity, or an active engagement with a subject. It can also suggest a process of developing interest, especially when used in the past tense: Ele se interessou por música clássica depois de ouvir um concerto.
Comparing both structures with parallel examples
It helps to see both constructions side by side to feel the difference in focus.
O curso interessa a muitos estudantes.
Focus: The course is interesting to many students. The course is the subject that causes interest.
Muitos estudantes se interessam por o curso.
Focus: The students take an interest in the course. The students are the subject who are interested.
O projeto interessa a empresas estrangeiras.
Focus: The project attracts foreign companies.
As empresas estrangeiras se interessam por o projeto.
Focus: The companies show interest in the project.
When both are possible
Often both structures are acceptable and the choice depends on what you want to emphasize: the appealing thing (interessar a) or the interested person (interessar-se por).
That distinction matters stylistically and pragmatically, especially in formal writing: official reports may prefer the impersonal interessa a while conversations and personal statements often use interessa-se por.
Pronoun placement and clitic rules
Portuguese pronoun placement can change depending on whether the verb is conjugated and the sentence type. In everyday Brazilian Portuguese, próclise (placing the pronoun before the verb) is common with negation, question words, and subordinating conjunctions. Enclise (after the verb) is more common in neutral declarative sentences and in written Portuguese.
Examples with interessar forms:
Ele não se interessa por esportes. (Pronoun before verb because of negation.)
Você já se interessou por arte moderna? (Pronoun before verb because of question word already.)
A aula se interessa a mim is incorrect because interessar a requires the thing as the subject. Correct: A aula me interessa or Eu me interesso por a aula.
Tense and aspect: talking about becoming interested
Use past tenses with interessar-se por to show when someone became interested, and with interessar a to say that something was interesting to someone at a past time.
Examples:
Ontem eu me interessei por fotografia documental.
Meaning: Yesterday I became interested in documentary photography.
A exposição interessou a muita gente no sábado.
Meaning: The exhibition interested a lot of people on Saturday.
For ongoing states use the imperfect: Ela se interessava por ciência desde criança. For a simple fact use the present: Isso interessa a muitos alunos.
Special cases and colloquial alternatives
In colloquial Brazilian Portuguese, speakers sometimes use the verb gostar with prepositions to express interest more simply, especially when talking about hobbies or tastes: Eu gosto de fotografia instead of Eu me interesso por fotografia. Both are correct but carry slightly different meanings: gostar de expresses liking, while interessar-se por emphasizes curiosity or intellectual interest.
Another colloquial pattern is usar gostar to avoid complex pronoun placement: Isso me interessa is common and natural rather than Isso interessa a mim.
Using para instead of a with interessar a
Many speakers use para mim or para você in informal speech to clarify the indirect object: Isso interessa para mim. This is widely accepted in spoken Brazilian Portuguese, though more formal written Portuguese prefers the structure with the clitic pronoun: Isso me interessa or Isso interessa a mim.
Common mistakes and how to avoid them
1. Incorrect subject agreement: Remember the verb interessar agrees with the subject, which is the thing that causes interest in the interessar a construction. If the subject is plural, use interessam. Example: Esses livros interessam a muitos leitores.
2. Mixing reflexive and non-reflexive forms: Do not drop the reflexive pronoun when you mean that a person is interested in something. Incorrect: Eu interesso por música. Correct: Eu me interesso por música.
3. Wrong preposition: With the reflexive form always use por to introduce the object of interest. Incorrect: Ela se interessa em ciência. Correct: Ela se interessa por ciência.
4. Awkward literal translations from English: English speakers may try to translate I am interested in as Eu sou interessado em, which is sometimes okay but changes nuance and can sound stilted. Prefer Eu me interesso por or Eu gosto de for natural speech.
Cultural and usage notes
Expressions of interest in Brazil are often casual and use verbs like gostar and curtir in everyday speech. Using interessar-se por can sound slightly more formal or academic, which is appropriate when discussing studies, research, or professional interests. In friendly conversations you will hear Eu gosto de, Eu curto, and Isso me interessa frequently.
When asking about hobbies, it is common to ask O que você gosta de fazer? rather than O que você se interessa por? However, in an interview or academic context, Pergunta: Você se interessa por pesquisa? is more appropriate.
Quick reference summary
Use interessar a when the thing or event is the subject that causes interest. The verb agrees with that thing, and the person interested is an indirect object.
Use interessar-se por when focusing on a person who is interested. The reflexive pronoun refers to the person and por introduces the object of interest.
Both can often be used to describe the same situation, but your choice changes the grammatical focus and the nuance of the sentence.
Conclusion
Mastering the difference between interessar a and interessar-se por will make your Portuguese sound more natural and precise. Remember that interessar a highlights the thing that causes interest, while interessar-se por highlights the person who feels interest. Pay attention to verb agreement, pronoun placement, and the preposition por. With exposure to Brazilian Portuguese in conversations, media, and reading, these structures will become intuitive.
