It depends on the subject, and what pronouns it passively carries.
Answer:
How will they explain it?
They will explain it carefully.
We will explain it carefully.
I will explain it carefully.
He will explain it carefully
No hay nada encima de la mesa. If you sound it out, it could either be "nada" or "nadie" but if you are talking about an object, then use "nada". If you are talking about someone not on the table, you would use "nadie" Nada: for object, Nadie: for person.
Hope this helped
1.) como se llaman
2.) como te llamas tu
