Well, who told you that story?
( Well ( , ( who ( ( ( told you ) ( that story ) ) ? ) ) ) )
(ROOT (SBARQ (NP (NNP Well)) (, ,) (WHNP (WP who)) (SQ (VBD told) (NP (PRP you)) (NP (DT that) (NN story))) (. ?)))
Are you able to recall which person told you the story?
( ( ( Are you ) ( able ( to ( recall ( which ( person ( told ( you ( the story ) ) ) ) ) ) ) ) ) ? )
(ROOT (SQ (VBP Are) (NP (PRP you)) (ADJP (JJ able) (S (VP (TO to) (VP (VB recall) (SBAR (WHNP (WDT which)) (S (NP (NN person)) (VP (VBD told) (S (NP (PRP you)) (NP (DT the) (NN story)))))))))) (. ?)))