( ( ( ( ( The following ) ( are examples ) ) : ) ( ( &#149; ( a ( distant siren ) ) ) ( might ( have ( ( a ( pulsing sound ) ) ( which ( becomes ( ( ( louder and ) louder ) ( &#149; ( ( ( a book ) falling ) ( might ( have ( a ( short ( , ( loud sound ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (DT The) (NN following)) (VP (VBP are) (NP (NNS examples)))) (: :) (S (NP (NP (CD &#149;)) (NP (DT a) (JJ distant) (NN siren))) (VP (MD might) (VP (VB have) (NP (NP (DT a) (VBG pulsing) (NN sound)) (SBAR (WHNP (WDT which)) (S (VP (VBZ becomes) (S (ADJP (JJR louder) (CC and) (JJR louder)) (NP (NP (CD &#149;)) (SBAR (S (NP (NP (DT a) (NN book)) (VP (VBG falling))) (VP (MD might) (VP (VB have) (NP (DT a) (JJ short) (, ,) (JJ loud) (NN sound))))))))))))))) (. .)))
The following are examples: &#149; a distant siren might have a pulsing sound which becomes louder and louder &#149; a book falling might have a short, loud sound.
(ROOT (S (NP (NP (DT The) (NN sound)) (PP (IN in) (NP (DT a) (JJ loud) (NN classroom)))) (VP (VBZ is) (NP (NP (DT an) (NN example)) (PP (IN of) (NP (NP (DT a) (NN form)) (PP (IN of) (NP (NN energy))))))) (. .)))