Spanish has two main past tenses, the preterite and the imperfect, and they do different jobs. This cheat sheet helps students decide whether an action was completed, repeated, ongoing, or part of a background description. It is useful for writing narratives, answering reading questions, and avoiding common translation mistakes.
The goal is to make tense choice clear through patterns, examples, and comparison rules.
Key Facts
- Use the preterite for completed actions with a clear beginning or end, such as Ayer estudié por dos horas.
- Use the imperfect for ongoing or repeated past actions, such as Cuando era niño, jugaba al fútbol los sábados.
- Regular -ar preterite endings are -é, -aste, -ó, -amos, -asteis, -aron, as in hablar: hablé, hablaste, habló.
- Regular -er and -ir preterite endings are -í, -iste, -ió, -imos, -isteis, -ieron, as in comer: comí, comiste, comió.
- Regular imperfect endings are -aba, -abas, -aba, -ábamos, -abais, -aban for -ar verbs and -ía, -ías, -ía, -íamos, -íais, -ían for -er and -ir verbs.
- The imperfect has only three common irregular verbs: ser = era, ir = iba, and ver = veía.
- Use preterite for interrupting actions and imperfect for actions already in progress, such as Yo leía cuando sonó el teléfono.
- Common preterite cues include ayer, anoche, una vez, de repente, and el año pasado, while common imperfect cues include siempre, a menudo, todos los días, mientras, and de niño.
Vocabulary
- Preterite
- The Spanish past tense used for completed actions, single events, or actions with a clear start or finish.
- Imperfect
- The Spanish past tense used for ongoing, repeated, habitual, or descriptive actions in the past.
- Time cue
- A word or phrase that suggests which past tense to use, such as ayer for preterite or siempre for imperfect.
- Habitual action
- An action that happened repeatedly in the past, often translated with used to or would in English.
- Background description
- Past information that describes setting, age, time, weather, feelings, or conditions rather than a completed event.
- Interrupting action
- A completed action in the preterite that happens while another action is already in progress in the imperfect.
Common Mistakes to Avoid
- Using preterite for every English past-tense verb is wrong because Spanish separates completed events from ongoing or repeated past actions.
- Choosing imperfect only because the sentence says when something happened is wrong because a clear date or time can still describe a completed preterite event.
- Forgetting that age, time, weather, and emotions usually use the imperfect is wrong because these often describe background conditions, such as Eran las ocho and Tenía quince años.
- Using the imperfect for a one-time finished action is wrong because actions like llegué, compré, and terminé show completion and need the preterite.
- Ignoring the action that interrupts another action is wrong because the ongoing action takes imperfect and the interruption takes preterite, as in Dormía cuando llamaste.
Practice Questions
- 1 Choose the correct tense and conjugate: Ayer yo (hablar) con mi profesora por 10 minutos.
- 2 Choose the correct tense and conjugate: Cuando tenía 7 años, nosotros (vivir) en México.
- 3 Complete the sentence with the correct past tense: Mientras ellos (comer), el camarero (traer) la cuenta.
- 4 Explain why the sentence De niño, iba al parque todos los domingos uses the imperfect instead of the preterite.
Understanding Spanish Preterite vs Imperfect Reference
A useful way to choose a past tense is to think like a camera operator. The imperfect is the wide shot. It shows the setting, weather, time, age, feelings, habits, and actions already happening.
The preterite is the close-up event that moves the story forward. It records what happened next. In a story, these tenses often work together rather than compete.
The background may say that people were eating, music was playing, and it was late. Then a specific event enters the scene, such as someone arrived or the lights went out. This pattern helps readers understand which details form the scene and which events change it.
The length of an action does not decide the tense by itself. A long action can use the preterite when the speaker sees it as one finished whole. For example, Estudié toda la noche treats the night of studying as a completed unit.
A short action can use the imperfect when it was repeated or described as part of a routine. Llamaba a mi abuela los domingos shows a regular habit. This is why English translations can be misleading.
English often uses one simple past form for several meanings. Spanish asks the speaker to show their viewpoint toward the action. Pay attention to whether the sentence gives a complete event, a repeated pattern, or an unfinished situation.
Some verbs change meaning depending on the past tense, so tense choice can carry important information. Sabía means that a person knew something as an existing fact. Supe often means that the person found out or learned it at a particular moment.
Conocía a una persona means someone was familiar with that person. Conocí a una persona can mean that the meeting happened for the first time. No quería salir describes an ongoing lack of desire.
No quiso salir can show a decision or refusal on one occasion. Students meet these differences in short stories, conversations about trips, family memories, news reports, and song lyrics. The tense helps explain not only what happened but how the speaker sees the event.
Time words are helpful clues, but they are not automatic rules. Siempre often points toward a habit, yet a sentence still needs meaning and context. A phrase such as mientras usually introduces an action in progress, while the other clause may tell what occurred during it.
When practicing, first mark the main events in a paragraph. Next, circle descriptions, routines, emotions, and conditions. Then connect interrupting events to the action already underway.
Learn verb forms carefully, especially written accents. An accent can distinguish hablo in the present from habló in the past.
Build separate study lists for preterite irregular forms, because many do not resemble the infinitive. Reading full paragraphs is more useful than memorizing isolated cue words, since real tense choices depend on the whole situation.