Final answer:
The sentence is incorrect. The correct form is "Yo estoy feliz".
Step-by-step explanation:
The sentence "Yo estás feliz" is incorrect.
The correct form should be "Yo estoy feliz" which means "I am happy". In Spanish, the subject pronouns and the verbs need to agree in person. 'Yo' is the first-person singular pronoun, which requires the verb 'estar' to be conjugated as 'estoy'.
Here is an example with the correct form: Yo estoy feliz de ir al cine esta noche. (I am happy to go to the movies tonight).
Learn more about Spanish