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 about when you were in school?
( What ( ( ( about when ) ( you ( were ( in school ) ) ) ) ? ) )
(ROOT (FRAG (WHNP (WDT What)) (SBAR (WHADVP (ADVP (RB about)) (WRB when)) (S (NP (PRP you)) (VP (VBD were) (PP (IN in) (NP (NN school)))))) (. ?)))