Hasn't vs. hadn't?

Question

How would you say "someone hadn't lived there since [insert year]"

Accepted Answer

Bonjour Sarah,
To express "someone hadn't lived there since [insert year]", you would say:
Personne ne vivait là depuis 2004 = Nobody had lived here since 2004
-> here it is a case of "sequences of tenses" - use L'Imparfait
Take a look at the 2 sentences below: 
  - Le Présent (with negation) - Present Perfect:
Personne ne vit là depuis 2004 = Nobody has lived here since 2004
 - L'Imparfait (with negation) - Past Perfect:
Personne ne vivait là depuis 2004 = Nobody had lived here since 2004
Take a look et the following link: 
Using the present tense (Le Présent) - and not the compound past (Le Passé Composé) - in sentences with "depuis" (since/for) in French (French Prepositions of Time)
I hope this is helpful.
Bonne journée !

Answer

Bonjour Sarah,
The lesson explains the use of depuis with the passé composé -- Personne n'y a (has) habité  depuis ....
Personne n'y avait (had) habité depuis ....   would be plus-que-parfait not passé composé
Not sure if this answers your query or not?
Bonne journée
Jim