when to use 'since' and 'for'

[Anonymous]

which is correct ?

we have lived in this city since one year
we have lived in this city for one year

[MikeNewYork]

which is correct ?

we have lived in this city since one year
we have lived in this city for one year

In that sentence, use "for". "Since" requires a fixed point in time: 1999, August, last year, etc. :wink:

[Tdol]

For = how long
since = when it started