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Pretérito Imperfecto in Spanish
08.06.2026
15 minutes to read
When you need to talk not about what happened, but about how everything was — Pretérito Imperfecto takes the stage. This is a past tense for descriptions, habits and background: it does not fix a moment, it paints a picture.
Table of contents
How the past imperfect tense is formed in Spanish?
The preterite imperfect is one of the most "convenient" tenses in Spanish. Why? Because there are almost no irregular verbs here. Only three — ser, ir and ver. All other verbs in the Spanish language are conjugated strictly according to the rule, without exceptions.
The principle of formation is simple: we take the stem of the verb and add the ending. Verbs of the first group (-AR) receive one set of endings, verbs of the second and third groups (-ER, -IR) receive another, and moreover the endings of both groups coincide.
The principle of formation is simple: we take the stem of the verb and add the ending. Verbs of the first group (-AR) receive one set of endings, verbs of the second and third groups (-ER, -IR) receive another, and moreover the endings of both groups coincide.
Pay attention to the stress: in -AR verbs in the nosotros form the stressed á is written — hablábamos. In -ER/-IR verbs the stress falls on í in all forms without exception — this is that very dot over the i that cannot be skipped in writing.
Now the three exceptions that will have to be memorised separately:
Ser: era, eras, era, éramos, erais, eran
Ir: iba, ibas, iba, íbamos, ibais, iban
Ver: veía, veías, veía, veíamos, veíais, veían
Ver is formally irregular, but in practice almost regular — its stem ve- is preserved in all forms, and the standard endings of the -ER/-IR group are simply added to it. Not difficult to remember.
It is worth mentioning separately the verbs with stem alternation — those that in the Presente change the vowel (e→ie, o→ue, etc.). In the imperfect this alternation does not happen. Poder in Presente gives puedo, puedes — but in the imperfect it is calm: podía, podías, podía. This is a pleasant exception to the rule about exceptions.
Now the three exceptions that will have to be memorised separately:
Ser: era, eras, era, éramos, erais, eran
Ir: iba, ibas, iba, íbamos, ibais, iban
Ver: veía, veías, veía, veíamos, veíais, veían
Ver is formally irregular, but in practice almost regular — its stem ve- is preserved in all forms, and the standard endings of the -ER/-IR group are simply added to it. Not difficult to remember.
It is worth mentioning separately the verbs with stem alternation — those that in the Presente change the vowel (e→ie, o→ue, etc.). In the imperfect this alternation does not happen. Poder in Presente gives puedo, puedes — but in the imperfect it is calm: podía, podías, podía. This is a pleasant exception to the rule about exceptions.
How Pretérito Imperfecto is used in Spanish?
The main thing to understand about the imperfect: it describes not an event, but circumstances. Not "what happened", but "how everything looked", "what was going on", "what was customary". Here are four main scenarios where you cannot do without it.
Description in the past. The appearance of people, the setting, the weather, the mood — everything that made up the background of events. If you open a story with the words "it was a quiet summer night" or "he looked tired" — this is the imperfect. Era una noche tranquila. Él parecía cansado.
Habitual and repeated actions. Everything that in the past was done regularly, out of habit or with a certain frequency. English constructions "used to do", "would go every day", "usually cooked" — a direct path to the imperfect. Cada verano íbamos al mar. Mi madre siempre cocinaba el domingo.
A continuing action as a background for another event. This is one of the most frequent cases in live speech. Something was happening — and then something else occurred. The first (background, process) — imperfect, the second (a specific event) — Indefinido. Leía un libro cuando sonó el teléfono. Was reading a book (background) — the phone rang (event).
Polite requests and softened statements. In conversational speech the imperfect often replaces the present tense to make a phrase less direct and more polite. Quería preguntarte algo instead of Quiero preguntarte algo sounds softer and more delicate. This technique is actively used in the service industry and business communication.
Description in the past. The appearance of people, the setting, the weather, the mood — everything that made up the background of events. If you open a story with the words "it was a quiet summer night" or "he looked tired" — this is the imperfect. Era una noche tranquila. Él parecía cansado.
Habitual and repeated actions. Everything that in the past was done regularly, out of habit or with a certain frequency. English constructions "used to do", "would go every day", "usually cooked" — a direct path to the imperfect. Cada verano íbamos al mar. Mi madre siempre cocinaba el domingo.
A continuing action as a background for another event. This is one of the most frequent cases in live speech. Something was happening — and then something else occurred. The first (background, process) — imperfect, the second (a specific event) — Indefinido. Leía un libro cuando sonó el teléfono. Was reading a book (background) — the phone rang (event).
Polite requests and softened statements. In conversational speech the imperfect often replaces the present tense to make a phrase less direct and more polite. Quería preguntarte algo instead of Quiero preguntarte algo sounds softer and more delicate. This technique is actively used in the service industry and business communication.
Time markers
Certain words and phrases almost always signal the imperfect. There is no need to artificially memorise them — it is enough to learn to notice them in a text:
Special attention to mientras and cuando in the meaning of "at the moment when" — they often introduce precisely the background action in the imperfect, against which something in the Indefinido occurs.
Examples
Let us analyse several sentences to feel the difference between background and event.
De niño, mi padre coleccionaba sellos y los guardaba en un álbum enorme. — As a child, my father collected stamps and kept them in a huge album. Both verbs in the imperfect — a description of a habit from the past.
Mientras esperábamos el tren, empezó a llover. — While we were waiting for the train, it started to rain. Were waiting (process, background) — imperfect, it started to rain (event) — Indefinido.
La ciudad era pequeña, las calles estaban vacías y todo parecía detenido en el tiempo. — The city was small, the streets were empty and everything seemed frozen in time. Three verbs in a row in the imperfect — a classic description of a setting.
Antes no me gustaba el café, pero ahora no puedo vivir sin él. — Before I did not like coffee, but now I cannot live without it. The imperfect emphasises that this was a state in the past that has changed.
¿Podías ayudarme un momento? — Could you help me for a moment? A polite request through the imperfect — sounds soft and unobtrusive.
De niño, mi padre coleccionaba sellos y los guardaba en un álbum enorme. — As a child, my father collected stamps and kept them in a huge album. Both verbs in the imperfect — a description of a habit from the past.
Mientras esperábamos el tren, empezó a llover. — While we were waiting for the train, it started to rain. Were waiting (process, background) — imperfect, it started to rain (event) — Indefinido.
La ciudad era pequeña, las calles estaban vacías y todo parecía detenido en el tiempo. — The city was small, the streets were empty and everything seemed frozen in time. Three verbs in a row in the imperfect — a classic description of a setting.
Antes no me gustaba el café, pero ahora no puedo vivir sin él. — Before I did not like coffee, but now I cannot live without it. The imperfect emphasises that this was a state in the past that has changed.
¿Podías ayudarme un momento? — Could you help me for a moment? A polite request through the imperfect — sounds soft and unobtrusive.
The difference between Pretérito Imperfecto and other past tenses
The most common mistake is confusing the imperfect with Pretérito Indefinido. Both describe the past, but they do so in a fundamentally different way.
Pretérito Indefinido is a completed action. It happened, it finished, and it has clear boundaries in time. The verb in this form answers the question "what happened?". Ayer fui al médico. Yesterday I went to the doctor — a specific completed episode.
Pretérito Imperfecto is an uncompleted process, a state or a repeated action without emphasis on its beginning or end. The verb answers the question "what was happening? what was everything like?". De niño iba al médico a menudo. As a child I often went to the doctor — regularity, not a specific case.
Pretérito Perfecto Compuesto connects the past with the present — the action occurred in an unclosed time period or has relevance to the current moment. Hoy he ido al médico. Today I went to the doctor — today is still continuing.
Pretérito Pluscuamperfecto describes an action that was completed before another past moment. This is "the past within the past". Cuando llegué, el médico ya se había ido. When I arrived, the doctor had already left.
Pretérito Indefinido is a completed action. It happened, it finished, and it has clear boundaries in time. The verb in this form answers the question "what happened?". Ayer fui al médico. Yesterday I went to the doctor — a specific completed episode.
Pretérito Imperfecto is an uncompleted process, a state or a repeated action without emphasis on its beginning or end. The verb answers the question "what was happening? what was everything like?". De niño iba al médico a menudo. As a child I often went to the doctor — regularity, not a specific case.
Pretérito Perfecto Compuesto connects the past with the present — the action occurred in an unclosed time period or has relevance to the current moment. Hoy he ido al médico. Today I went to the doctor — today is still continuing.
Pretérito Pluscuamperfecto describes an action that was completed before another past moment. This is "the past within the past". Cuando llegué, el médico ya se había ido. When I arrived, the doctor had already left.
A practical way not to make a mistake: mentally ask yourself — are you telling about a specific episode or painting a picture? If it is an episode with clear boundaries — Indefinido. If it is a picture, a habit or a background — Imperfecto. This simple question resolves most difficulties without unnecessary rules.
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