I'm going by bus.
je vais en Espagne
I go by bus.
"Je vais" means "I go." Example- Je vais à Montagne.
"Je vais être tard" isn't correct in French. I think you would say "Je vais être en retard". In this case, it means : "I know but I think I will be late"
Literal translation is Je suis allez a ville In modern every day French it would be said as 'Je vais en ville'.
When I go into town/city
I'm going to Norway in August.
Je vais en France.
"Je vais" means "I go." Example- Je vais à Montagne.
On tuesday, i go to.... [mardi=tuesday, je vais (aller)=to go]
Je vais à Bordeaux means "I'm going to Bordeaux" in French.
I go or I am going