Spanish language Q&A Forum

When do i use este and when do i use esto? For example: Este camion es muy grande vs esto camion es muy grande

In a previous question, mover was used in a present tense (Ella mueve...). However, in this quiz, mover was used in a reflexive tense (El perro se mueve). How do we know when to use or not use the reflexive tense? 

The last subsection, Difference between todo/-a and cada, explains something entirely different.

I'm curious what the content of the missing chapter should be.

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.  

The sentence, "Fernando will begin complaining when he arrives".  If he always complains about everything, would it be "cuando llega"?

I never thought that I was misusing definite articles until this exercise.  Apparently, I either add a definitive article when it's not required or omit it when it is.  Is there a rule that I'm missing with this?

For example: For "Asimismo, gobiernos y organizaciones trabajan en políticas para una gestión sostenible del agua.", I wrote: "Asimismo, LOS gobiernos y organizaciones trabajan en LAS políticas para una gestión sostenible del agua".  Why shouldn't I use definite articles where I did?