Spanish language Q&A Forum

Hello,

Can anyone please explain the use of ser in these 2 examples? Both are describing temporary states (I think.) They are from a video that has many sentences to translate..  This seems not to accord with the normal use of ser.

1. No sea tonto.  (I would tanslate this as "Don't act silly." We are not saying "You are a silly person."}
2. Era obvio que el conductor no había sido lo suficientemente cuidadoso.  (I don't think this is a passive construction. Shouln't this be "no había estado"?)

I've learned elsewhere that "como" is often much better to use than "que" when asking the kinds of questions covered in this lesson. I did not find a lesson that covers their comparative usages. Maybe would be good to include "cual."

"-¿A ________ vamos a ver esta noche? -A Luis y Gerardo."

I wrote 'quién' because I thought the questioner wouldn't necessarily know that they would be seeing more than one person. That answer was marked wrong.  Would we normally use the plural when asking about an unknown number of persons?

EDIT: I just looked at the question again and see that there was a hint (which I managed to miss) about which PLURAL to use,  but my question about which we would normally use still stands.

In the examples of  "¿Quién prepara la fiesta a Sofía?" and "Nosotros les preparamos la cena a nuestros invitados."

Why use 'a' instead of 'para' (for) or 'por' (on behalf of)?

Ricky