Answer:
estás
Explanation:
From this point of view, Marco is asking a person directly, so he would use estas, instead of any other form of conjugation.
Secondly, eres is used to describe a permanent trait about a person; the way that Luisa is feeling, is only temporary, therefore you should not use Eres.
Answer:
Venga
Explanation:
Es posible que Ernesto venga a la boda.
Answer: Resumen de lo que se conoce actualmente sobre el problema, incluidos estudios previos relevantes
Explanation:
