Spanish language Q&A Forum

Why do we use the subjunctive here when something is unknown, but when we use 'aunque' it is the other way around?  By that, I mean that we only use the subjunctive when the information is shared and the indicative is used to introduce new information.

Hello,

I found the following sentence in a Spanish grammar book that I am studying: “Por que es azul el cielo?” 

I thought the sentence would be: “Por que el cielo es azul?” 

What kind of rule does the first sentence fall under and how would I know when to structure my sentences like that? For example, would this only happen with questions?

Muchísimas gracias!

He imprimido nuestras fotografías del viaje, ¿quieres ver ________?I have printed the pictures of our trip, do you want to see some?(HINT: Choose the correct singular form.)
I don't understand why alguna is correct here and not algunas. I get that alguna can mean 'the odd one' but this test question doesn't look like the odd one, and it almost exactly matches an example in the quick lesson, where the correct form is given as algunas. 

Now everywhere I look online it suggests that this should only say 'lo dejé' and not 'me lo dejé'. Why would they add 'me'? It doesn't feel like it needs it, as the 'I forgot' bit is understood by dejé, and the 'it' by lo. It isn't reflexive I don't think. 

Thanks!

Hola,

Why is there an 'a' is this sentence? Is suerte considered a 'person' for the personal a to apply or is it an obligatory preposition after tentar?

Gracias,

Benhur