In level F5, lesson 28, is the phrase:

"Do (you) have any adventure book?"

which Fluez translates as "Tiene algún libro de aventuras?" and will not accept "Tiene cualquier libro de aventuras". Wondering when to use 'cualquier' and when to use 'algún' as, according to my notes, they both meany "any".

Wondering what 'cuando' is accented here?

I already know when that movie came out, (it) was in 2003
Yo ya sé cuándo salió esa película, fue en 2003

This seems to be a statement about when the movie came out, not a question per se. Although I can imagine that it probably was in reply to such a question as "When did that movie come out". Still, why is it accented?

Here's a question from somewhere in level 5:

I loved Argentina
me encantó Argentina

Why is the past tense used instead of the imperfect? Two reasons I thought the imperfect was correct here:

1. In describes an emotional state
2. It's not a single point in time that's finished.

Thanks for clarifying.

Subtle but mostly clear!

Makes sense. Thanks.

That's helpful and clear. thanks.

In level 5, lesson 22, we learn when to use preterite, imperfect and indicative conditional for the "tricky verb" poder. According to my notes, the latter is used when you mean "I could", "I may"
or "I would be able to". So, if that's the case, why is the imperfect used in this sentence?

I could see him every day, but now (he) doesn’t live here anymore
yo podía verlo todos los días pero ahora ya no vive aquí

From Level 5, lesson 22:

I had another mouse, but now (I) don’t know where it is
yo tenía otro mouse pero ahora no sé dónde está

Why is donde accented? This isn't a question.

Is there any way to distinguish when one uses "entonces" and when one uses "así"?

Here's another example from Level 5:

Let’s go surfing on Saturday because (it)’s going to be hot and there will surely be a lot of waves.

Vamos a hacer surf el sábado porque va a hacer calor y por seguro hay muchas olas.

Why is the present tense "hay" used instead of a future tense? BTW, Google Translate translates that sentence as:

Vamos a surfear el sábado porque hará calor y seguro habrá muchas olas.

I was having the same problem at those leves. Every time I came across the phrase "allá", "aquí", "de allá" and "de aquí", I made a note of the English and Spanish phrases. It seemed to me that the "de" is needed when the "here" or "there" refers to something more general rather than a specific place. See some usage examples below that I collected. I also have a note (not sure which lesson this is from) that the preposition "de" is needed when you could say "that is here" or "that is there".

Examples from the lessons:
That necklace there is very nice. How much does (it) cost?
Ese collar de allá es muy bonito. ¿Cuánto cuesta?

(I) bought a very nice necklace for my friend(f) at this store here
Compré un collar muy bonito para mi amiga en esta tienda de aquí

No problem, I can wait for you there
No problema, puedo esperarte allá

este de aquí or ese de allá
this one here or that one there?

tuvieron cuatro reuniones allá
they had four meetings there

pero después abrieron una oficina nueva en bogota y tuvo que ir allá
but afterwards they opened an office in bogota and she had to go there

Estan allá, a la derecha
(Referring to some necklaces in a store) They are there, to the right

Ellos van a estar allá unos días
They are going to be there a few days

en esta tienda de aquí hay algunos pareos preciosos.
In this store here there are some gorgeous beach wraps