Please remain quiet.
( Please ( ( remain quiet ) . ) )
(ROOT (S (INTJ (UH Please)) (VP (VB remain) (ADJP (JJ quiet))) (. .)))
Please don't make a sound.
( Please ( ( ( do n't ) ( make ( a sound ) ) ) . ) )
(ROOT (S (INTJ (UH Please)) (VP (VB do) (RB n't) (VP (VB make) (NP (DT a) (NN sound)))) (. .)))