5.2 Past Tenses: Preterite vs. Imperfect

5.2 Past Tenses: Preterite vs. Imperfect

Spanish features two primary past tenses in the indicative mood: the Preterite (el pretérito indefinido) and the Imperfect (el pretérito imperfecto). Understanding when to use each tense depends not on when an event occurred, but on how the speaker views the aspect (completion versus continuation) of the past action.

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1. The Preterite Tense (El Pretérito Indefinido)

The preterite is used for past actions viewed as completed wholes with explicit beginnings or ends.

Regular Preterite Conjugations

Notice that -er and -ir verbs share identical endings in the preterite. Pay close attention to written accent marks on the yo and él/ella/Ud. forms.

Orthographic Changes in the Yo Form (-car, -gar, -zar)

To maintain original consonantal sounds before the vowel -é in the first person singular:

• -car $\rightarrow$ -qué: buscar $\rightarrow$ busqué | tocar $\rightarrow$ toqué
• -gar $\rightarrow$ -gué: llegar $\rightarrow$ llegué | jugar $\rightarrow$ jugué
• -zar $\rightarrow$ -cé: empezar $\rightarrow$ empecé | almorzar $\rightarrow$ almorcé

Strong-Stem Irregular Preterites

Irregular preterite stems share a unique set of endings that do not feature written accent marks: -e, -iste, -o, -imos, -isteis, -ieron (or -eron for j-stems).

Other Important Preterite Irregulars

• Ser / Ir (identical in preterite): fui, fuiste, fue, fuimos, fuisteis, fueron.
• Dar: di, diste, dio, dimos, disteis, dieron.
• Ver: vi, viste, vio, vimos, visteis, vieron.
• Third-Person -ir Stem Changers: Only -ir verbs that stem-change in the present undergo a single-vowel shift ($e \rightarrow i$ or $o \rightarrow u$) in the 3rd person singular and plural preterite:
  • dormir $\rightarrow$ durmió, durmieron
  • pedir $\rightarrow$ pidió, pidieron
  • preferir $\rightarrow$ prefirió, prefirieron

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2. The Imperfect Tense (El Pretérito Imperfecto)

The imperfect describes ongoing, incomplete, or habitual past events. It provides background detail (time, age, weather, mental/physical states) without focusing on beginnings or completions.

Regular Imperfect Conjugations

The Only Three Irregular Imperfect Verbs

1. Ser: era, eras, era, éramos, erais, eran
2. Ir: iba, ibas, iba, íbamos, ibais, iban
3. Ver: veía, veías, veía, veíamos, veíais, veían

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3. Side-by-Side Functional Comparison & Trigger Words

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4. Meaning-Change Verbs in Past Tenses

Certain verbs shift their core English translation depending on aspectual selection:

Exam Application Example

• Cuando supimos (found out - preterite) la noticia, ya era (was - imperfect) demasiado tarde.