Spanish language Q&A Forum

Does the verb "costar" always take the preposition "a" when referring to the person OR entity upon which the cost is falling? Here, "los gobiernos" are not people or favorite pets, yet the personal a is apparently indicated. 

Creo que no   -Wouldn't this call the subjunctive (conozca) NOT the present indicative?

In this text, 'those who' is translated in two different ways.. are they sinónimos?

quienes osaban visitarlo podían susurrar sus anhelos

Aquellos que se adentraban en la oscuridad del bosque

I used 'los que'. Is that always wrong?

Gracias

definitivamente vale la pena si visite españa. Hay aeropuerto

Where are the notes on using "Una/Unas" before a noun? I was under the impression that spanish didn't like using articles as much as english.

Does “pienso que no” = “no pienso” = “no lo pienso”?  Thanks.

Are there other examples besides just these? I have a Spanish dictionary that says that the word "internet" can be either feminine or masculine, with both "la internet" and "el internet" being correct. Could you provide any other words that do the same besides just the few that are provided in the lesson?