Open the door, please.
( ( ( ( Open ( the door ) ) , ) please ) . )
(ROOT (S (VP (VB Open) (NP (DT the) (NN door)) (, ,) (VB please)) (. .)))
The door remained closed.
( ( The door ) ( ( remained closed ) . ) )
(ROOT (S (NP (DT The) (NN door)) (VP (VBD remained) (ADJP (JJ closed))) (. .)))