Final answer:
In the sentence 'O Fui al médico.' fui means 'I was.'
Step-by-step explanation:
In the sentence O Fui al médico., fui means "I was."
The verb fui is the past tense of the verb ser, which means to be. It is used to indicate an action or state that happened in the past. In this sentence, fui is used to express that the person went to the doctor in the past.
Example: Fui al médico para una revisión el mes pasado. (I went to the doctor for a check-up last month.)
Learn more about Meaning of the word 'fui' in Spanish sentences