Spanish language Q&A Forum

In the question:

They will be very cold when they go to Scotland next December.

It seems to me that this is a quite certain plan, like one of the examples here: ‘ Cuando voy de vacaciones a Tenerife me hospedo en el hotel Olimpia.’

So I thought the answer should be in the indicative:

Tendrán mucho frío cuando irán a Escocia el próximo diciembre.

But the correct answer was in the subjunctive:

Tendrán mucho frío cuando vayan a Escocia el próximo diciembre.

Why is that? Is it a mistake?

I was doing a writing exercise, and I put "estar por" instead of "estar a punto de" and I was corrected and "estar por" wasn't shown as an option. I'm wondering why since I have heard and used this expression frequently. 

The phrase that has to be translated was, "He was about to go out the door when..."

It is not clear when to use qué after mismo. For e.g.

Andrea lleva la misma camisa que llevaba ayer.

Vs.

No me cuentes de nuevo la misma historia.

Se me ha olvidado la llave.  Does the lesson apply to this usage also?

The speakers are having a phone conversation.There, where you live, is it cold? : ___, donde tú vives ¿hace mucho frío?

Why is alli not possible in this question? Considering that they are on the phone, they might feel quite far apart from each other.

No entiendo por qué el Rey hizo eso. Él lo hizo porque quiso

Unless the Spanish have a definition of "conjunction" that differs from the one I've always understood, both "por qué" and 
"porque" are both being used as conjunctions in those sentences. It is the sense of their use which differs.

Can these two uses be distinguished in spoken Spanish and if so, how?

If I had answered, "Me estoy muriendo de sed" instead, would it be viewed as correct? 

 Since the preposition “a” as a personal “a” wouldn’t “les” also be a correct?