CUhE (http://www.lojban.org/en/publications/reference_grammar/chapter10.html)

Forms a question which asks when, where, or in what mode the rest of the bridi is
true. See PU, CAhA, TAhE, and BAI.

do cu'e klama le zarci You [When/Where?] go to-the store? When are you going
to the store?

