What are you going to do Sunday morning?
It means "Where are you going Monday morning".
por
This literally means "How is your school?" in Spanish. This form of "is" refers to identity, not condition. It's asking about the character of the school, not the current events. In English we might say, "What is your school like?" to ask the same thing.
"Are you going to English class in the morning or in the afternoon?" is the English translation for "Vas a la clase de ingles en la mañana o en la tarde?"
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
What are you going to do Sunday morning?
It means "Where are you going Monday morning".
You are going to be late: Vas a llegar tarde. I'm going to be late: Voy a llegar tarde.
por
This is Spanish shorthand for "¿por qué tú no vas?". In English, it means "why are you not going?"
You would say "¿Vas a jugar al voleibol más tarde?"
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?
Después de clases
This literally means "How is your school?" in Spanish. This form of "is" refers to identity, not condition. It's asking about the character of the school, not the current events. In English we might say, "What is your school like?" to ask the same thing.
Porque no tengo dónde pernoctar / pasar la noche.
¿Por qué va / van / vas/ vais allá a Nueva York?