Spanish language Q&A Forum

How do you know which infinitives require the preposition A to link the verbs?

"Yo visité unos cuarentas países cuando era joven" (taken from a test, correct answer), pero "unos ochenta minutos". 

I would have expected that "unos cuarenta países" is correct. Why isn't it?

This lesson is a little confusing because under "Examples and Resources", el Preterito Perfecto is shown, after being told above that el Preterito Indefinido is preferred in Latam.  

here it says ¨Nosotros no deberíamos haberlo escuchado.¨ Should it be  Nosotros no deberíamos haberle escuchado? Le instead of Lo?

Is there a specific quiz related to this topic that I can practice? How do I access that?

Un bolígrafo también es una pluma. Si?

This is a quote from kwiziq that is supposed to be explanatory, but it does not suggest a rule to know which adjectives have this form of ending. How are we to know which adjectives have this irregularity? Why can they not just follow the regular formula?

Why is the first al used? I thought al meant “to the” or “at the”.  It doesn’t make sense to say, Ana loves to the man.

Thank you in advance for your help,

Kim

Hi, I also have a similar doubt. We are using sere in first example ( When I am older, I will be a doctor) i.e simple future but we are using vayan (subjunctive) in this statement:  Tendrán mucho frío cuando vayan a Escocia el próximo diciembre.

Why are we using vayan instead of iran (simple future) here like in first example?

Please help thank you!