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))))))))) (. ?)))
How about when you went to bed?
( ( How ( about ( when ( you ( went ( to bed ) ) ) ) ) ) ? )
(ROOT (FRAG (SBAR (WHADVP (WRB How)) (S (ADJP (RB about) (SBAR (WHADVP (WRB when)) (S (NP (PRP you)) (VP (VBD went) (PP (TO to) (NP (NN bed))))))))) (. ?)))