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.
Answer:
Nosotros vamos a estudiar
Answer:
in the first one u could put, juegas or descansas
Explanation:
in the second one u could put, tengo or vi
hope i helped u
