Come in, please! 
( ( Come in ) ( , ( please ! ) ) )
(ROOT (S (PP (VBN Come) (PP (IN in))) (, ,) (VP (VB please)) (. !)))
Come in, please! 
( ( Come in ) ( , ( please ! ) ) )
(ROOT (S (PP (VBN Come) (PP (IN in))) (, ,) (VP (VB please)) (. !)))