How to Say "i completed" in Spanish
The Spanish word for “i completed” is “terminé” — A1 level. This is a very common word in everyday Spanish.

Examples
¡Terminé mi tarea! Ahora puedo jugar.
I finished my homework! Now I can play.
Ayer terminé el libro que me recomendaste.
Yesterday I finished the book you recommended to me.
Después de tres horas, por fin terminé la mudanza.
After three hours, I finally finished the move.
The Accent Mark is Key
The accent mark on the 'e' (terminé) is essential! Without it (termine), the word means 'that I finish' or 'he/she/it finishes' in a special mood used for wishes or doubts.
One-Time Action
This verb form tells you the action of finishing was completed at a specific moment in the past. It's done and dusted.
Using 'Terminé' vs. 'Estaba Terminando'
Mistake: “Usar 'terminaba' cuando la acción terminó, como en 'Yo terminaba a las cinco.' (I was finishing at five.)”
Correction: Use 'terminé' for a definite ending time: 'Terminé a las cinco.' (I finished at five.) Use 'terminaba' only when talking about a continuous action in the past.
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