Spanish language Q&A Forum

The exceptions are both words that describe places of origin.  Is this a pattern or are these two examples that just happened to be place names.  I can see three possibilities:

1) When you have a place of origin adjective (from Spain, from Analusia) you always use gendered plural endings.

2) When you use gendered plural endings for adjectives ending in z or l you always use gendered plural endings

3) It's just a coincidence in the examples and neither 1 or 2 is a pattern.

Which one of these cases is closest to being correct?

It only says "We can also form the superlative of some adverbs with the suffix -ísimo", but not which ones these are. 

There's something on cerca & lejos, but how about other irregular adverbs (those having an independant form, like bien)?

It seems these would not have any -ísimo from, as I neither found "lo hiciste bienísimo" nor "lo hiciste buenísimo", but solely "lo hiciste muy bien".

Is there a rule for choosing between the preterite + present participle and the imperfect + present participle eg:

Estuvimos hablando con la gente/Estábamos hablando con la gente

She has been working there

Ella he hecho trabajado ayahtrabaja allá 

Ella trabaja allí 

A esto libro le faltan dos paginas. I found this sentence and him confused why we use a with it

In this question I answered "éramos" instead of "fuimos" since the text referred to "used to be."  Why was that wrong? I get that  the "completed action in the past" hint confused the situation. Shouldn't the question be clarified, or am I missing something here? 
Nosotros ________ muy buenos estudiantes.We used to be very good students.(HINT: Refers to a completed action in the past.)

From the lesson:

"Note that while "fue" is generally translated into "was" in English, "era" can be translated into "was", "used to be" and "would be"."

In a sentence like "I don't know what he knows" or "I don't know if he knows" the sentence can express doubt or merely be a statement of fact. Wouldn't the choice of whether to use the indicative or subjunctive depend on what you are trying to convery (ie:  "No sé lo que sepa" if I am trying to express doubt about what he knows but "No sé lo que sabe" if I am simply stating the fact that I don't know what he knows)?

When you say "colloquially", is it a less formal/ slang-like way to use it?

And which region is it used?