How did this man know?
( How ( ( ( did ( this man ) ) know ) ? ) )
(ROOT (SBARQ (WHADVP (WRB How)) (SQ (VBD did) (NP (DT this) (NN man)) (VP (VB know))) (. ?)))
The man knew nothing.
( ( The man ) ( ( knew nothing ) . ) )
(ROOT (S (NP (DT The) (NN man)) (VP (VBD knew) (NP (NN nothing))) (. .)))