Spanish Preterite vs Imperfect: When to Use Which

Why This Matters for Your Grade

The preterite and imperfect are both past tenses, and knowing when to use each one is critical for the Leaving Cert. Examiners specifically look for correct usage of these tenses in essays, and misusing them is one of the most common errors at Higher Level. Getting this right can lift your writing from H4 territory into H2-H1 range.

The Basic Difference

Think of it this way:

• Preterite: Completed actions — things that happened at a specific point and finished. Like a photograph.
• Imperfect: Ongoing or habitual actions in the past — descriptions, background, routines. Like a video playing in the background.

When to Use the Preterite

Completed Actions

Actions that started and finished at a definite time:

• Ayer fui al cine (Yesterday I went to the cinema)
• Comi una pizza (I ate a pizza)
• El ano pasado viaje a Espana (Last year I travelled to Spain)

A Chain of Events

Sequential actions that happened one after another:

• Me levante, desayune y sali de casa (I got up, had breakfast, and left the house)

A Specific Number of Times

• Fui tres veces (I went three times)
• Lo lei dos veces (I read it twice)

Time Markers That Signal Preterite

These words almost always indicate preterite: ayer (yesterday), anoche (last night), el ano pasado (last year), una vez (once), de repente (suddenly), el martes pasado (last Tuesday).

When to Use the Imperfect

Habitual or Repeated Actions

Things you used to do regularly:

• De nino, jugaba al futbol todos los dias (As a child, I used to play football every day)
• Ibamos a la playa cada verano (We used to go to the beach every summer)

Descriptions in the Past

Setting the scene, describing what things were like:

• Hacia sol y hacia calor (It was sunny and hot)
• La casa era grande y tenia un jardin (The house was big and had a garden)
• Ella tenia 15 anos (She was 15 years old)

Ongoing Actions (Background)

What was happening when something else occurred:

• Leia un libro cuando sono el telefono (I was reading a book when the phone rang)

Time Markers That Signal Imperfect

These words usually indicate imperfect: siempre (always), todos los dias (every day), a menudo (often), normalmente (normally), de nino/a (as a child), cada verano (every summer).

Using Both Together

In good Spanish writing, you constantly switch between preterite and imperfect. The imperfect sets the scene; the preterite tells what happened:

• Llovia (imperfect — background) cuando llegue (preterite — event) a casa
• Estaba (imperfect — ongoing state) nerviosa porque el examen empezo (preterite — specific event) a las diez

This is exactly the pattern examiners want to see in your essays.

Common Mistakes to Avoid

• Using preterite for descriptions: "La casa fue grande" is wrong. Use "La casa era grande"
• Using imperfect for completed single events: "Ayer comia una pizza" is wrong. Use "Ayer comi una pizza"
• Forgetting to set the scene: Starting a narrative with only preterite makes it sound like a list of events without context

Practice Strategy for the Leaving Cert

• When writing about the past, ask yourself for each verb: "Is this an action that is completed, or is it describing the background/a routine?"
• Practise writing short narratives (100 words) about holidays, childhood memories, or daily routines, consciously choosing the correct tense for each verb
• Review past paper essays and identify where the marking scheme expects preterite vs imperfect
• In your oral exam, use both tenses when discussing past experiences to demonstrate grammatical range