( Opaque ( ( ( is not ) ( ( allowing light ) ( to ( pass through ) ) ) ) . ) )
(ROOT (S (NP (NNP Opaque)) (VP (VBZ is) (RB not) (VP (VBG allowing) (NP (NN light)) (S (VP (TO to) (VP (VB pass) (PRT (RP through))))))) (. .)))
Opaque is not allowing light to pass through.
(ROOT (S (NP (NNP Opaque)) (VP (VBZ is) (NP (NP (DT the) (NN term)) (PP (IN for) (NP (NN matter))) (SBAR (WHNP (WDT that)) (S (VP (VBZ does) (RB not) (VP (VB let) (NP (DT any) (JJ light) (NN pass)) (PRT (RP through)))))))) (. .)))