I DID: Fui, Era from Ser and Estuve, Estaba from Estar

Ser

  • Fui – preterite done and dusted 
  • Era imperfect storytelling 

Estar 

  • Estuve preterite done and dusted 
  • Estaba imperfect storytelling

I DID: Fui, Era from Ser and Estuve, Estaba from Estar

🔧 THE TWO DECISIONS

Step 1: Ser or Estar? Is it temporary (feelings, location, mood, situation)?

  If yes → Use estar
   If no → Use ser

Step 2: Preterite or Imperfect? Is it the main point or a completed moment?

  If yes → Use preterite
   If no → Use imperfect

  1. I was very tired after the trip.
    Estaba muy cansada después del viaje.
    🛠 State → estar. Ongoing condition → imperfect.
  2. I was nervous during the interview.
    Estuve nerviosa durante la entrevista.
    🛠 State → estar. Specific event → preterite.
  3. I was a waitress for five years.
    Fui mesera por cinco años.
    🛠 Role/identity → ser. Time-limited → preterite.
  4. I was at home all day.
    Estuve en casa todo el día.
    🛠 Location → estar. Specific timeframe → preterite.
  5. I was really happy with the result.
    Estaba muy feliz con el resultado.
    🛠 Emotion → estar. Background feeling → imperfect.
  6. I was sick last weekend.
    Estuve enferma el fin de semana pasado.
    🛠 Temporary health state → estar. Specific period → preterite.
  7. I was a shy child.
    Era una niña tímida.
    🛠 Personality trait → ser. Ongoing childhood quality → imperfect.
  8. I was in the kitchen when you called.
    Estaba en la cocina cuando me llamaste.
    🛠 Location → estar. Background of action → imperfect.
  9. I was a student at that time.
    Era estudiante en ese tiempo.
    🛠 Role → ser. Contextual background → imperfect.
  10. I was sad, but I didn’t say anything.
    Estaba triste, pero no dije nada.
    🛠 Emotion → estar. Background mood → imperfect. Completed action → preterite.
  11. I was at the park this morning.
    Estuve en el parque esta mañana.
    🛠 Location → estar. Specific timeframe → preterite.
  12. I was very busy yesterday.
    Estuve muy ocupada ayer.
    🛠 Temporary condition → estar. Defined timeframe → preterite.
  13. I was his girlfriend.
    Fui su novia.
    🛠 Relationship role → ser. Finished relationship → preterite.
  14. I was angry because he didn’t call.
    Estuve enojada porque no me llamó.
    🛠 Emotion → estar. Defined emotional reaction → preterite.
  15. I was at the store five minutes ago.
    Estuve en la tienda hace cinco minutos.
    🛠 Location → estar. Specific point in time → preterite.
  16. I was in love with him.
    Estaba enamorada de él.
    🛠 Emotion → estar. Ongoing emotional state → imperfect.
  17. I was afraid of dogs as a kid.
    Tenía miedo de los perros cuando era niña.
    🛠 Fear → tener miedo. Childhood state → imperfect.
  18. I was in a meeting when she arrived.
    Estaba en una reunión cuando ella llegó.
    🛠 Location → estar. Background during another action → imperfect.
  19. I was the one who made the decision.
    Fui yo quien tomó la decisión.
    🛠 Identity statement → ser. Completed moment → preterite.
  20. I was cold all night.
    Tuve frío toda la noche.
    🛠 Physical state → tener frío. Specific timeframe → preterite.

SER → permanent states or conditions, origin, occupation, and time
ESTAR → temporary states or conditions, location, and progressive tenses (like estoy buscando)