"Where is the red door?"
Translation:Càite a bheil an doras dearg?
I would have expected càit, I've got nothing for cà
It's very briefly mentioned in the tips, under the "Questions" section, as to whether càit or càite, but I don't think that note was in there in version 1.
then it's just a one-line notice:
N.B. The word càite shortens to càit when it comes before a word beginning with a vowel.