How about when you were in school?
( ( How ( about ( when ( you ( were ( in school ) ) ) ) ) ) ? )
(ROOT (FRAG (SBAR (WHADVP (WRB How)) (S (ADJP (RB about) (SBAR (WHADVP (WRB when)) (S (NP (PRP you)) (VP (VBD were) (PP (IN in) (NP (NN school))))))))) (. ?)))
What did you eat for lunch when you were in school?
( What ( ( ( did you ) ( ( eat ( for lunch ) ) ( when ( you ( were ( in school ) ) ) ) ) ) ? ) )
(ROOT (SBARQ (WHNP (WP What)) (SQ (VBD did) (NP (PRP you)) (VP (VB eat) (PP (IN for) (NP (NN lunch))) (SBAR (WHADVP (WRB when)) (S (NP (PRP you)) (VP (VBD were) (PP (IN in) (NP (NN school)))))))) (. ?)))