Sortir de [ville]

Question

I don't understand this particular line:
The context in which you could use sortir de [ville] to express to leave [city] is very specific in French (note that it doesn't apply to countries,states,regions etc). It would only refer to an action in progress
 
Does this mean you can't use sortir de [ville] in future/past tense (Je sortirai de Paris), but you CAN use it in other tenses with countries, states, regions, etc?
Or does this mean you cannot use it with countries, states, regions...and you can only use it with cities if it's an action in progress?

Céline Pickard · Accepted Answer

Bonjour Tanya,
You're right that you cannot use "sortir de" + [countries, states, regions] and you can only use it with cities. However, you could hear a native speaker say:
On sortira de Paris quand on aura passé la prochaine sortie = We will be leaving Paris when we'll have passed the next exit.
Context: two people are driving in a car for example
-> Attention: "sortir" is in Le Futur Simple but it is still referring to an action in progress (i.e. the driving)
 
I hope this is helpful.
Bonne journée !