( ( Nonlinear ( hearing aids ) ) ( ( are ( designed ( to ( ( amplify ( ( a ( wide range ) ) ( of sounds ) ) ) ( so ( that ( they ( ( are ( audible ( to ( the ( hearing-impaired listener ) ) ) ) ) ( without ( becoming ( uncomfortably loud ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Nonlinear) (NN hearing) (NNS aids)) (VP (VBP are) (VP (VBN designed) (S (VP (TO to) (VP (VB amplify) (NP (NP (DT a) (JJ wide) (NN range)) (PP (IN of) (NP (NNS sounds)))) (SBAR (RB so) (IN that) (S (NP (PRP they)) (VP (VBP are) (ADJP (JJ audible) (PP (TO to) (NP (DT the) (JJ hearing-impaired) (NN listener)))) (PP (IN without) (S (VP (VBG becoming) (ADJP (RB uncomfortably) (JJ loud))))))))))))) (. .)))
Nonlinear hearing aids are designed to amplify a wide range of sounds so that they are audible to the hearing-impaired listener without becoming uncomfortably loud.
(ROOT (S (S (VP (VBN Amplified))) (, ,) (NP (PRP it)) (VP (VBZ becomes) (SBAR (S (NP (NNP louder)) (VP (VBZ happens) (VP (VB do) (NP (DT the) (NN sound)) (PP (IN during) (NP (DT a) (NN resonance)))))))) (. .)))