estar vs ser

Hola Wendy L.

You’re absolutely right to question this. Both “será muy feliz” and “estará muy feliz” can be possible depending on the context, and we understand how this can feel ambiguous.

In this specific case, the exercise is aiming for “será muy feliz” to express a more general or inherent idea (e.g. someone being a happy person or having a happy life), rather than a temporary emotional state, which would typically use “estar”.

That said, your point about ambiguity is valid, so we’ve now added a hint to the exercise to make the intended meaning clearer and help guide learners toward the expected answer.

Thanks for flagging this!

Saludos

Silvia