( But ( ( if ( ( the mechanism ) ( is ( set ( on ( the ( lecture table ) ) ) ) ) ) ) ( , ( ( the sound ) ( suddenly ( ( becomes ( very ( loud ( as ( ( a result ) ( of ( the resonance ) ) ) ) ) ) ) . ) ) ) ) ) )
(ROOT (S (CC But) (SBAR (IN if) (S (NP (DT the) (NN mechanism)) (VP (VBZ is) (VP (VBN set) (PP (IN on) (NP (DT the) (NN lecture) (NN table))))))) (, ,) (NP (DT the) (NN sound)) (ADVP (RB suddenly)) (VP (VBZ becomes) (ADJP (RB very) (JJ loud) (PP (IN as) (NP (NP (DT a) (NN result)) (PP (IN of) (NP (DT the) (NN resonance))))))) (. .)))
But if the mechanism is set on the lecture table, the sound suddenly becomes very loud as a result of the resonance.
(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)))))))) (. .)))