Answer:
The correct answer is, Todos los veranos Juan nada en el mar.
Explanation:
This is because you aren't talking about yourself or anyone else in the past. Juan is swimming in the present, for example, you were there at the beach with a friend and you tell your friend what Juan is doing. You would say Juan is swimming in the ocean.
Okay, so first off what mural? Second what are the measurements? I need this information for me to able to help you. Also, I'd think that this a Math question not a Spanish question. :)
Alli esta is grammatically correct. It is correct because alli esta means "there is" and in your example, There is the first floor, sounds better. The first floor is there doesn't sound correct to me. Hope this helps.
