that 's hardly any fun to watch 
(ROOT (S (NP (DT that)) (VP (VBZ 's) (ADVP (RB hardly)) (NP (NP (DT any) (NN fun)) (SBAR (S (VP (TO to) (VP (VB watch)))))))))
(ROOT (S (NP (DT )) (VP (VBZ ) (ADVP (RB )) (NP (NP (DT ) (NN )) (SBAR (S (VP (TO ) (VP (VB )))))))))