Condicional de Probabilidade Passada

Level 6

The Condicional de Probabilidade Passada uses the conditional tense (e.g., seria, teria) not for 'would,' but to mean 'must have been' or 'was probably' regarding the past.

How It Works

While the conditional tense is usually taught for hypothetical 'if' scenarios, it has a specialized 'epistemic' use in high-level Portuguese. This usage follows the logic of the 'Future of the Past.'

1. The Logic of Probability:
Just as the Future of the Present expresses probability in the now (e.g., Serão dez horas - It is probably ten o'clock), the conditional expresses probability in the past. Instead of stating a fact with the Imperfect (Eram dez horas), you use the conditional (Seriam dez horas) to imply 'It was probably ten o'clock.'

2. Journalistic 'Allegedly':
In news reports, the compound form (teria + past participle) is used to report actions that haven't been legally proven yet. For example: O suspeito teria roubado o banco (The suspect reportedly/allegedly robbed the bank).

3. Register and Usage:
This is a formal construction. In everyday conversation, native speakers prefer using the Pretérito Imperfeito or the modal devia + infinitive. Using this pattern in a casual setting will make you sound like a news anchor or a formal historian.

Examples (4)

  1. Seriam oito horas da noite quando o telefone tocou.

    It must have been about eight o'clock at night when the phone rang.

    Word by Word: Would-be eight hours of-the night when the telephone rang.

    Here, 'seriam' expresses a guess about the specific time in the past.

  2. Naquela época, o escritor teria uns vinte anos.

    At that time, the writer was probably about twenty years old.

    Word by Word: In-that epoch, the writer would-have some twenty years.

    Using 'teria' instead of 'tinha' indicates the speaker is estimating the age.

  3. O criminoso teria entrado pela janela dos fundos.

    The criminal reportedly entered through the back window.

    Word by Word: The criminal would-have entered through-the window of-the backs.

    This compound conditional is common in journalism to describe alleged past actions.

  4. Haveria cerca de mil pessoas no protesto de ontem.

    There were probably around a thousand people at yesterday's protest.

    Word by Word: There-would-be about of thousand people in-the protest of yesterday.

    Speculating about a past quantity using the verb 'haver'.

Common Mistakes

  • Using the conditional for past probability in casual conversation.

    Ontem eu teria muita fome.
    Ontem eu estava com muita fome.

    In casual speech, use the Imperfeito. The conditional version sounds overly dramatic or like a news report.

  • Thinking it refers to a future event because of the name 'Futuro do Pretérito'.

    Ele teria chegado amanhã.
    Ele chegará amanhã.

    Despite the name, this specific 'probability' use refers strictly to the past, not the future.

How It Connects

Tap a pattern to see what it builds on and what it leads to.

Condicional de Probabilidade PassadaLevel 6

Learn This First

To use the 'condicional de probabilidade passada', you need to be comfortable with the conjugation of the 'futuro do pretérito' (conditional tense). You also need to understand the conceptual shift where future-oriented verb forms are used not to describe the future, but to express uncertainty or speculation about a specific time—in this case, the past.