You didn't like them?
( You ( ( ( did n't ) ( like them ) ) ? ) )
(ROOT (S (NP (PRP You)) (VP (VBD did) (RB n't) (VP (VB like) (NP (PRP them)))) (. ?)))
Who were they?
( Who ( ( were they ) ? ) )
(ROOT (SBARQ (WHNP (WP Who)) (SQ (VBD were) (NP (PRP they))) (. ?)))