Spanish language Q&A Forum

I am not clear on when to use which term.  In the passage, there is "el esfuerzo medioambiental" and also "modelo ambiental".  Are they interchangeable?  Thanks.

Why are these two sentences different? One uses "para comprar" and the other just "comprar." I want to understand the rule that allows you to omit "para" before an infinitive.

1. Le costó 5 dólares comprarlo de nuevo.

2. Él necesita 5 dólares para comprarlo.

How would you say, "They work as much as they play," meaning quantity of time they spend? 

¿«Trabajan tanto como juegan.»?

But if you say, "They work as well as they play," meaning with the same quality of enjoyment, ¿would you say, 

«Trabajan tan como juegan.»?

La narradora dice “las pilas” pero el texto dice “la pilas”, y el programa te corrige si escribes “las pilas” en tu transcripción. Me gusta esta expresión que no conocía antes. Creo que ya la entiendo, pero tal vez merezca una pequeña nota. ¡Gracias!

In Kwiziq, there's a lesson on -ito etc and a lesson on -illo etc. I'm living in Ecuador and have traveled around Central and South America a bit, and I've heard both groups of suffixes used in what seems to be the exact same way. I guess I'm looking for a little clarity on whether they are 100% interchangeable. 

Am I correct that team -ito and team -illo mean the same thing - they make a word diminutive, softer, affectionate - and that the real difference is just in local usage? I can use either group of suffixes, and not be wrong, but one group is just more common in certain areas than the other?

My apologies if you've answered this elsewhere. I reviewed the other questions, and I did not find an answer that makes me confident that my understanding is correct.

And thanks, in advance for your help.

Puedo usar el futuro simples en esta oracione? "En la reunión, vamos a hablar de nuevas tecnologías y vamos a intercambiar ideas." Podria decir: "hablaremos de nuevas tecnologias y intercambiaremos ideas"?

What is the indirect object pronoun for

A Javier ya a Sara ____

can i clarify that why isn't "hay tantas cosas por hacer" correct instead of "Hay tantas cosas que hacer"? It would be useful if you could direct me to the relevant notes, if there is. 

Another question is that, why is "todos los vecinos de la comunidad" using tuvimos instead of tuvieron when they had a meeting?

One last one is to clarify is "representar" + preposition A, a fixed expression to express on behalf of (someone) and that in this sentence, it is not personal A because we are referring to a general group of people? or the group of neighbors are not considered as general but specific persons?

Your replies are much appreciated. thanks.