Spanish language Q&A Forum

In the quiz question: "Todos los estudiantes son estadounidenses ________. All the students are from the United States except us." the question refuses any answer with "nosotras". Surely "nosotras" should be as equally possible as "nosotros" in this response, or am I misunderstanding?

know whether tu or usted is required.  Could it not be either, depending on the formality, which is not stated?

I’m confused between hace and hacía + time frame. Do you have a deep dive on this? Thanks

I got this sentence in a quiz

No puedo ver _____ en la muchedumbre.  

The answer was "a Paula y Cristina".    

I notice that sometimes you put an a before every name, like "a Paula y a Cristina". Is this optional, or are there certain circumstances when the a is required before each person?   

I think I understand the difference in the usage of adentro, vs. dentro (de) but does the same principle apply to afuera vs. afuera (de)?