How to Say "i was" in Spanish
The most common Spanish word for “i was” is “estuve” — use 'estuve' to talk about a specific, completed location or a temporary state/feeling you experienced in the past..
estuve
/es-TOO-veh//esˈtu.βe/

Examples
Ayer estuve en el supermercado.
Yesterday I was at the supermarket.
Estuve en casa de mi abuela todo el fin de semana.
I was at my grandmother's house all weekend.
Nunca estuve en Argentina, pero me encantaría ir.
I have never been to Argentina, but I would love to go.
Estuve enfermo la semana pasada.
I was sick last week.
Location in the Past (Estuve vs. Fui)
Use estuve to talk about where you were. It's for location. Use fui (from the verb ser) for what you were (e.g., a profession) or your relationship to someone. Example: Estuve en la fiesta (I was at the party), but Fui el anfitrión (I was the host).
Temporary vs. Permanent States in the Past
Just like in the present, estuve is for temporary conditions. Estuve cansado means 'I was tired' (but I got better). To talk about a permanent quality someone had, you'd use a form of ser, like Él era alto (He was tall).
For Ongoing States in the Past
Mistake: “Cuando mi mamá llamó, estuve en la cocina.”
Correction: Use `estaba` for background information or actions that were in progress. Say `Cuando mi mamá llamó, estaba en la cocina.` (When my mom called, I was in the kitchen). `Estuve` implies you went to the kitchen, stayed for a bit, and then left—a completed action.
fui
/fwee//fwi/

Examples
De niño, fui muy tímido.
As a child, I was very shy.
Fui profesor durante diez años.
I was a teacher for ten years.
La película fue muy buena.
The movie was very good.
Past Tense for Being
'Fui' is how you say 'I was' for things that describe who or what you were in a completed past time. It comes from the verb 'ser' (to be).
Confusing 'fui' with 'estuve'
Mistake: “Ayer fui enfermo.”
Correction: Ayer estuve enfermo. Use 'fui' for what you *were* (your identity or a core trait), and 'estuve' (from estar) for how you *were* (your state or condition).
Estuve vs. Fui for 'I was'
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