Can I replace that with "je" and say "Ni estis en Ĉinio je du fojoj"? I know that's not usual, I just want to know if that works :) We have to prepare to listen all kind of people from all kind of countries... Maybe some people will say it that way (?)
If we were to say: I went there three times. Would it be: Mi iris tie trifoje? with the word together? With any number and foje after, do you put them together? How would fifteen times work? dek kvinfoje?