The man looked at the girl.
( ( The man ) ( ( looked ( at ( the girl ) ) ) . ) )
(ROOT (S (NP (DT The) (NN man)) (VP (VBD looked) (PP (IN at) (NP (DT the) (NN girl)))) (. .)))
The man never noticed the girl was there. 
( ( The man ) ( never ( ( noticed ( ( the girl ) ( was there ) ) ) . ) ) )
(ROOT (S (NP (DT The) (NN man)) (ADVP (RB never)) (VP (VBD noticed) (SBAR (S (NP (DT the) (NN girl)) (VP (VBD was) (ADVP (RB there)))))) (. .)))