Answer:
¿Usted conoce a mi vecino?
Explanation:
<em>Saber</em> is to know a fact and <em>conocer </em>means to be familiar with something/someone. In this case, <em>conocer</em> is used to say if you know someone.
<em>Hope this helps!</em>
Answer:
Todos (I think)
Explanation:
Because it’s masculine and more than 1
I’m pretty sure it’s true