Open the door, please.
( ( ( ( Open ( the door ) ) , ) please ) . )
(ROOT (S (VP (VB Open) (NP (DT the) (NN door)) (, ,) (VB please)) (. .)))
Please open the door.
( Please ( ( open ( the door ) ) . ) )
(ROOT (S (INTJ (UH Please)) (VP (VB open) (NP (DT the) (NN door))) (. .)))