Spanish language Q&A Forum

I would've said estos without it, but it made me second guess myself and put este. What is this hint trying to say? I'm not understanding how I misinterpreted it. 

Lo que dice Eva H. sobre mezclar frutas es muy cierto. Las posibilidades son ilimitadas, como el universo. Pero, todas las frutas tienen diferentes niveles de digestibilidad y mezclar una fruta ácida con una alcalina puede causar indigestión, dolorosa o no. Creo que la gente inculta ha asumido que como la "fruta" se considera ser "sana", al combinar muchas frutas los resultados serán "más sanos".  Sin embargo, una macedonia de frutas suele ser la causa de un dolor de barriga y, por supuesto, que las zanahorias y las espinacas sean "saludables" también, no significa que su adición a un zumo de frutas lo mejore.

¡Por las posibilidades ilimitadas del Universo!

Hi, i cannot see any transcript about this reading passage. i can just listen to it. what can be the problem?

I am getting thoroughly confused. What is the difference between the two ?

I know the preterite and the present perfect. Never heard of preterito indefinido

This word seems to change all the time! I had the wrong answer so next time it came up in a question I put the answer it gave me last time and it said wrong and gave the answer as the one I chose in the first place!  This has happened several times. How and why does this word change?

Su autora es Irene Orce

‘We had to play football without kneepads’ - in English  we say shin pads (UK) or shin guards (US). Knee pads are what you use for skating. SpanishDict is telling me shin guards are ‘espinilleras’, but I have no knowledge about about which is correct/if one word may be used in a certain country and another elsewhere etc

I'm having trouble consistently distinguishing between using 'a' or 'en' when talking about being somewhere.

For instance, in the dialog, "... Alberto estará  en la reunión...", 

Would we say "estará en la reunión" to mean someone will be 'in' the meeting, while "estará a la reunión" has a connotation indicating a location 'at' the meeting?

Or is it always customary to use 'en' in cases like this?