Spanish language Q&A Forum

Is this construction interchangeable with Al+infinitive or is there a nuance where I would choose one over the other? 

I noticed a few mistakes here in this lesson. In some areas, for the "tu", "ellas/ellos", and "nosotros/nosotras" forms of "acaber" there are double "ba" syllables. For example, there's "acababas" instead of "acabas", "acababan" instead of "acaban", and "acababamos" instead of "acabamos". I've double checked elsewhere to verify the correct spellings of these forms and nowhere else did I find the double "ba" syllables.

1) Why do you say “No tienen casa” and not “No tienen un casa”?   2) Is it “algunas” and not algunos because it agrees with personas?  3) Could you also say, La gente buscó ayuda de iglesias… as well as en iglesias?   This is the first time I did one of these exercises and I found it really helpful!

How do we know when to use recordar vs acordarse de?  Is one used more than the other in some regions or for certain occasions/emotions?

E.g. Siempre nos acordaremos de ellos.

Why is usted placed in the middle of the verbal structure? After estar but before the gerund.

Las chicas ________ el desfile de moda. The girls saw the fashion show. (HINT: Conjugate “ver” in El Pretérito Perfecto) without the hint, would vieron be more appropriate? i'm having a hard time differentiating, and would not think preterito perfecto was correct here. additionally, la costurera ha deshecho todos los puntos de la falda - why wouldn't this also just be deshizo? (preterite)? there isn't really anything connecting it to the present ?

Are the ending masculine -os or feminine -as based on the noun in the sentence or the adjective of the sentence?

My dictionary says fruit (the plant) is la fruta. Why is the sentence -Los frutos rojos  and not las frutas rojas ? 

Why is turbulence always plural? Do some words not have a single form? If so, is there a place I can find a list of them? Thanks.

The answer appears to treat estar as a verb like gustar.  It doesn´t appear as such in your list.  What am I missing?