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 sitting across from each other at breakfast.  
( They ( ( were ( ( ( sitting across ) ( from ( each other ) ) ) ( at breakfast ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBD were) (VP (VBG sitting) (PRT (RP across)) (PP (IN from) (NP (DT each) (JJ other))) (PP (IN at) (NP (NN breakfast))))) (. .)))