*ʔayya kutubin katabat Salma risaalata=ha qabla ʔan taqraʔa kulla=ha ?
which-ACC books-GEN wrote-3F.SG Salma dissertation-ACC=3F.PL before COMP read-3F.SG all-ACC=3F.PL
(‘*Which books had Salma written her (Ph.D.) dissertation before she read all of?’)