Then Shuman claims that Linux provides no graphical user interface.
( Then ( Shuman ( ( claims ( that ( Linux ( provides ( no ( graphical ( user interface ) ) ) ) ) ) ) . ) ) )
(ROOT (S (RB Then) (NP (NNP Shuman)) (VP (VBZ claims) (SBAR (IN that) (S (NP (NNP Linux)) (VP (VBZ provides) (NP (DT no) (JJ graphical) (NN user) (NN interface)))))) (. .)))
They knew what they were talking about.
( They ( ( knew ( what ( they ( were ( talking about ) ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBD knew) (SBAR (WHNP (WP what)) (S (NP (PRP they)) (VP (VBD were) (VP (VBG talking) (IN about)))))) (. .)))