Porque no tengo dónde pernoctar / pasar la noche.
Por que vas in English means: Why are you going? The 'you' seems an error for 'te' = 'you'. Por que te vas = Why are you going away
Que vas a hacer translates to "What are you going to do?"
What school do you go to ?
What are you going to do Sunday morning?
Ana no duerme
Translation: ¿A que horas vas a trabajar?
"What are you going to have for dinner today?"
It is Spanish for: You will have to wait in line.
Que va usted/vas hacer hoy? (Formal/informal)
Que vas a hacer esta noche means "What are you going to do tonight"
¿Por qué va / van / vas/ vais allá a Nueva York?
I will not say why you are going to cry. This looks like three sentences. I will not way. Why? Are you going to cry?