Introduction
Learning everyday expressions helps you sound natural in Brazilian Portuguese. One common phrase in English is I’ll let you know, used to promise future information. This article explains how to say that idea in Brazilian Portuguese, with variations, examples, and tips for different contexts and politeness levels.
Core translations and quick overview
The simplest and most direct way to say I’ll let you know is to use vou te avisar. This phrase works in most informal situations with friends, family, or colleagues you know well. For more formal or polite contexts, Brazilians often choose other verbs and constructions.
Basic informal option
Vou te avisar
This literally means I will let you know or I will notify you. Use it with friends, coworkers you are familiar with, and family. The subject eu is usually dropped because the verb conjugation makes the meaning clear.
Examples:
Vou te avisar quando eu chegar em casa.
Vou te avisar se algo mudar.
Formal and neutral alternatives
Vou avisar você
This is the same meaning but a bit more neutral than vou te avisar because it uses the full pronoun você instead of the clitic te. Use this with acquaintances, customers, or people of higher status when you want to be polite but not overly formal.
Examples:
Vou avisar você assim que tiver uma resposta.
Vou avisar você sobre a reunião amanhã.
Very formal or professional phrasing
Informarei or vou informar
For emails, official messages, or workplaces where formality is expected, use informar. Informarei is a single-word future tense meaning I will inform. Vou informar is a slightly less formal alternative but still professional.
Examples:
Informarei a equipe sobre as mudanças.
Vou informar o cliente assim que tivermos novidades.
Common variations and nuances
Brazilian Portuguese offers several ways to express I’ll let you know, each with its nuance. Below are frequent alternatives with explanations and usage notes.
Using avisar in different constructions
Te aviso
This is the present tense used like a promise: I’ll tell you or I’ll let you know. It sounds very natural and is often used in spoken Brazilian Portuguese.
Examples:
Te aviso mais tarde.
Se eu souber, te aviso.
Usage note: Te aviso is common in speech. For more emphasis on the future time, use vou te avisar or te avisarei.
Using avisar with passive or indirect constructions
Vou avisar sobre + topic
Add sobre + topic when you want to specify what you’ll let them know about.
Examples:
Vou avisar sobre os horários da aula.
Vou avisar sobre as vagas disponíveis.
Other verbs: avisar vs avisar que
Avisar que
Use avisar que when you want to add a full clause explaining the content.
Examples:
Vou avisar que a reunião mudou de horário.
Vou avisar que você ligou.
Dizer and contar as alternatives
Vou te dizer and vou te contar
These are less formal and good for casual contexts. Vou te dizer literally I will tell you and vou te contar can mean I’ll let you know, especially when referring to personal news or details.
Examples:
Vou te dizer quando souber o resultado.
Se tiver alguma novidade, eu te conto.
Promising to check and reply
Vou ver or vou checar seguido de e te aviso
When you need to check something before responding, Brazilians often say I’ll check and let you know. Combine verbs to make it natural.
Examples:
Vou ver e te aviso até amanhã.
Vou checar com o time e te aviso o mais rápido possível.
Contextual examples: everyday situations
Below are short dialogues and phrases for specific situations. These show which expressions sound natural for different social contexts.
With friends and family
Scenario: Planning dinner with friends.
A: Quer ir jantar amanhã?
B: Ainda não sei a que horas eu saio do trabalho. Vou te avisar mais tarde.
Scenario: Sharing personal news.
A: Você vai ao casamento no sábado?
B: Não tenho certeza. Se eu for, vou te contar.
At work or in a professional email
Scenario: Responding to a client request.
Prezado cliente,
Recebemos sua solicitação. Informarei sobre o prazo assim que o setor confirmar.
Atenciosamente,
Scenario: Team chat.
Pessoal, ainda não tivemos confirmação do fornecedor. Vou avisar vocês assim que tivermos uma data.
When you need to check and follow up
Scenario: Confirming availability.
A: Você pode participar da reunião amanhã?
B: Preciso verificar minha agenda. Vou ver e te aviso até o fim do dia.
Scenario: Asking for time to respond.
Pode me dar até segunda para decidir?
Claro. Te aviso na segunda de manhã.
Politeness, tone, and register
The choice of phrase depends on your relationship with the listener and the level of formality. Here are guidelines to help you choose the right expression.
Casual and friendly
Use vou te avisar, te aviso, vou te contar, or vou te dizer. These are warm, relaxed, and common among friends, family, and peers.
Neutral and polite
Use vou avisar você or vou avisar with the indirect object positioned after the verb. This tone suits coworkers, acquaintances, or mixed company.
Formal and professional
Use informarei, vou informar, or avisarei. These are appropriate for business emails, formal requests, or when addressing clients and superiors. They convey respect and clarity.
Regional and colloquial variations
Brazil is linguistically diverse, and colloquial speech can vary by region. While the core expressions are widely understood, you might hear local variants.
Common colloquial shortcuts
Te aviso often becomes aviso or contracted forms in fast speech. Some speakers may say eu te aviso for emphasis, especially if they want to reassure someone.
Examples:
Eu te aviso, fica tranquilo.
Se mudar, eu te aviso, beleza?
Less common but useful alternatives
Dou um toque
Dou um toque literalmente means I’ll give you a touch, but colloquially it means I’ll contact you or I’ll let you know. This is casual and often used among friends.
Examples:
Dou um toque quando estiver a caminho.
Se der certo, dou um toque pra você.
Grammar tips and pronoun placement
Understanding pronoun placement helps you form natural sentences. In Brazilian Portuguese, object pronouns usually come after the verb in spoken language, but both pre- and post-verbal positions are possible.
Clitic form te vs full pronoun você
Use te for informal direct address. It attaches to the verb as in te aviso or vou te avisar. Use você when a more neutral or polite tone is required: vou avisar você or vou avisar o senhor / a senhora in very formal contexts.
Formal future tense
To sound more formal or written, use future indicative or future subjunctive forms: avisarei, informarei, avisarei quando souber. These constructions are common in emails and official communication.
Examples:
Avisarei quando tivermos a confirmação.
Informarei a equipe após a reunião.
Practical tips for learners
Practice these phrases in context to build fluency. Focus on which phrases match your social environment: friends, work, or formal situations. Mimic native rhythm and contractions to sound natural.
Tip 1: Match formality to the situation
Use vou te avisar with friends, vou avisar você with acquaintances, and informarei in formal emails. Incorrect formality can sound rude or awkward.
Tip 2: Use follow-up timing
Add timing words to be clearer: mais tarde, amanhã, até amanhã, até o fim do dia. Native speakers often include a time frame when promising to follow up.
Examples:
Vou te avisar mais tarde.
Vou avisar você até amanhã de manhã.
Tip 3: Combine verbs for clarity
If you need to check something first, combine quero ver + avisar: Vou ver e te aviso. This shows you will take responsibility to follow up.
Sample phrases cheat sheet
Short list of useful phrases you can memorize and use immediately.
Vou te avisar — informal, I will let you know.
Te aviso — present promise, I’ll let you know.
Vou avisar você — neutral, I’ll let you know.
Informarei — formal, I will inform.
Vou informar — professional, I’ll inform.
Vou ver e te aviso — I’ll check and let you know.
Dou um toque — colloquial, I’ll give you a call or I’ll let you know.
Conclusion
Knowing how to say I’ll let you know in Brazilian Portuguese helps you handle social, work, and formal situations naturally. Use vou te avisar and te aviso for informal speech, vou avisar você or vou informar for neutral contexts, and informarei for formal communication. Practice these phrases with timing words and combinations like vou ver e te aviso to sound more fluent and reliable.
