ia + Infinitive

The ia + infinitivo pattern is a staple of natural Portuguese. It is formed by conjugating the verb ir in the pretérito imperfeito (ia, ias, ia, íamos, íeis, iam) followed by the infinitive. Just as vou + infinitivo means 'I am going to', ia + infinitivo means 'I was going to'. Note the difference from the past continuous (estava + gerúndio or estava a + infinitivo): ia + infinitivo implies the action hadn't started yet (an intention), whereas the past continuous means the action was already in progress. Because the 1st and 3rd person singular forms are identical (ia), subject pronouns (like eu or ele/ela/você) are often used for clarity if the context isn't obvious. To form the negative, simply place não before the auxiliary verb (e.g., não ia + infinitivo).

1. Interrupted Intentions:
It describes something you intended to do or that was on the verge of happening before an interruption.
Ex: Eu ia sair, mas o telefone tocou. (I was going to leave, but the phone rang.)

2. Reported Speech & Narrative (Future-in-the-Past):
It is used to report a future intention from a past perspective, as well as in narrative storytelling to describe a destined future event from a past perspective without any speech being reported.
Ex: Ele disse que ia chegar tarde. (He said he was going to arrive late.)
Ex: Ele mal sabia que ia encontrar o amor da sua vida. (Little did he know he was going to meet the love of his life.)

3. The Casual Conditional:
In spoken Portuguese, this construction frequently replaces the synthetic conditional (e.g., compraria). Note that this usage is strictly a feature of informal, spoken Portuguese; formal writing, academic essays, or professional settings require the synthetic conditional or conditional perfect. There is a regional difference here: European Portuguese overwhelmingly prefers the simple imperfeito (e.g., comprava) for this purpose. In Brazilian Portuguese, both ia + infinitivo and the simple imperfeito are used interchangeably in casual speech. It is also frequently used to replace the conditional perfect ('would have done') in past hypothetical scenarios.
Ex: Se eu fosse você, eu não ia fazer isso. (If I were you, I wouldn't do that.)
Ex: Se eu soubesse, eu não ia fazer isso. (If I had known, I wouldn't have done that.)
Ex: Se você não tivesse me avisado, eu ia fazer besteira. (If you hadn't warned me, I would have done something stupid.)

4. Polite Requests:
This pattern is frequently used to soften statements or requests, making them sound less demanding.
Ex: Eu ia pedir um favor... (I was going to ask a favor...)

5. Literal Motion (Past Habit):
While often used as an auxiliary, ir can also retain its literal meaning of motion to express a past habit ('used to go [do something]').
Ex: Quando eu era criança, eu ia nadar todos os dias. (When I was a child, I used to go swimming every day.)

6. Regional Nuances:

• Brazil: Object pronouns usually precede the infinitive (e.g., Eu ia te dizer). Note that while estava + gerúndio is the standard past progressive, ia + gerúndio (e.g., ia falando) carries a specific nuance of a gradual or cumulative action, rather than being a direct substitute.
• Portugal: Adding the preposition 'a' (ia a + infinitivo) mostly indicates an imminent action ('was about to'), while estava a + infinitivo is the true standard progressive. For pronoun placement, clitics can attach to either the auxiliary verb (Eu ia-te dizer) or the infinitive (Eu ia dizer-te). In negative sentences, the pronoun must precede the auxiliary verb (e.g., Eu não te ia dizer).

7. Avoiding Redundancy with Ir:
When the main verb is also ir (to go), prescriptive grammar considers ia ir redundant, and speakers often drop the infinitive to just use the auxiliary ia on its own. However, in spoken Brazilian Portuguese, saying ia ir is incredibly common and natural.
Ex: Eu ia à praia, mas choveu. / Eu ia ir à praia, mas choveu. (I was going to go to the beach, but it rained.)