Do you know how long we've been here? he asked one morning as they sat facing each other at breakfast.
( ( ( Do you ) ( know ( ( how long ) ( we ( 've ( been here ) ) ) ) ) ) ( ? ( he ( ( ( asked ( one morning ) ) ( as ( they ( sat ( ( facing ( each other ) ) ( at breakfast ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SQ (VBP Do) (NP (PRP you)) (VP (VB know) (SBAR (WHADVP (WRB how) (RB long)) (S (NP (PRP we)) (VP (VBP 've) (VP (VBN been) (ADVP (RB here)))))))) (. ?) (NP (PRP he)) (VP (VBD asked) (NP (CD one) (NN morning)) (SBAR (IN as) (S (NP (PRP they)) (VP (VBD sat) (S (VP (VBG facing) (NP (DT each) (JJ other)) (PP (IN at) (NP (NN breakfast))))))))) (. .)))
They were in completely separate rooms at breakfast time.  
( They ( ( were ( in ( ( ( completely separate ) rooms ) ( at ( breakfast time ) ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBD were) (PP (IN in) (NP (NP (ADJP (RB completely) (JJ separate)) (NNS rooms)) (PP (IN at) (NP (NN breakfast) (NN time)))))) (. .)))