The correct form of the verb to fill in the blank in the sentence "Gustavo (correr) por la mañana" is "corre."
How to write the sentence
The sentence "Gustavo corre por la mañana" is in Spanish and it translates to "Gustavo runs in the morning" in English.
In this sentence:
"Gustavo" is a person's name.
"corre" is the third-person singular form of the verb "correr," which means "to run."
"por la mañana" translates to "in the morning."
Therefore, the sentence describes an action performed by Gustavo, indicating that he engages in the activity of running specifically during the morning hours.