> My wife's permanent resident card is expired soon. We have not applied
> for citizenship. I tried to find the answer on USCIS website but it's
> not clear. it says I-175 is to remove conditions. My wife is not a
> conditional permanent resident as far as I know (that is for couples
> married in the US I believe).
> What form do we use for this? Is applying for citizenship enough? I
> mean, does that somehow "extend" the green card?
To renew an expiring, unconditional GC, form I-90 is used.
A conditional GC is indeed for somebody who is sponsored by a US citizen spouse
and is married to that spouse for less than 2 years.
I am not a lawyer.
For reliable advice, consult a competent immigration attorney.