Ser (to be) · Preterite
By TutorLily Editorial Team · Last updated
Ser in the Spanish preterite (pretérito indefinido) is: yo fui, tú fuiste, él/ella/usted fue, nosotros/as fuimos, vosotros/as fuisteis, ellos/ellas/ustedes fueron. The preterite of ser describes who or what something was at a specific completed moment in the past. Notably, the preterite forms of ser are identical to those of ir (to go) — context tells you which.
| To Be | Ser |
|---|---|
| I was | yo fui |
| you were | tú fuiste |
| he/she was | él/ella/usted fue |
| we were | nosotros/as fuimos |
| you were | vosotros/as fuisteis |
| they were | ellos/ellas/ustedes fueron |
Ser (to be) in context
Sentences that use ser in the preterite. Tap each to hear it.
I was a student in Barcelona.
You were very brave yesterday.
The party was fun.
We were the first to arrive.
You were perfect guests.
Those were the best years of my life.
Working with the preterite
The preterite describes a finished past action with a clear boundary — "ayer comí pizza" (yesterday I ate pizza). The key contrast is with the imperfect, which describes ongoing or repeated past actions without a defined endpoint. If you can substitute "used to" or "was doing" in English, you usually want the imperfect; if the action is one-and-done, you want the preterite. The irregular preterites (fui, hice, dije, tuve, vine, supe) are the highest-frequency in Spanish — front-load them.
Frequently asked questions
How do you conjugate ser in the preterite?
How do I know if 'fui' means 'I was' or 'I went'?
When do I use the preterite of ser instead of the imperfect?
Practice Ser (To Be) in real conversations
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