We are in a foundation??? Strange sentance. Sounds like its saying they are located inside a building excavation? Maybe they are....
We are in the building of some foundation (institution), like, let's say, National Foundation for Cancer Research. Although then using 'a' instead of 'the' would be surprising... but let's say that your interlocutor has no idea you were supposed to visit any foundation and it doesn't matter, than it should work. It is kind of a strange sentence now that I think about it.
Oh, also the word you mean is fundament. I think it's rather used in plural - fundamenty.
Ah tak, teraz rozumiem! We don't hear it used that way in Australia very much, more an American thing I think.
Could be "we are members of a foundation" or "we are joining a foundation" just seems a little ambiguous as "foundation" has a few meanings. Is probably fine for American learners.
Who cares, got it right anyway.
Bardzo dziękuję Jellei :)
Actually, "We are members of a foundation" is a possible, if not even better (because of the 'a vs the' problem) explanation. Google gives 11200 results for the exact phrase of "jesteśmy w fundacji". Many results seem to be connected with the so-called "1%" - in Polish tax declarations there is a section that allows you to donate 1% of your income tax to some public benefit organization - often a foundation, charity, NGO, etc. Therefore "jesteśmy w fundacji" could be used simply as a way to say that you support a given foundation year after year by this 1% rule.
No problem, glad to help :)