( ( For example ) ( , ( ( if ( you ( suddenly ( hear ( a ( loud sound ) ) ) ) ) ) ( , ( ( your ( whole body ) ) ( ( will jerk ) . ) ) ) ) ) )
(ROOT (S (PP (IN For) (NP (NN example))) (, ,) (SBAR (IN if) (S (NP (PRP you)) (ADVP (RB suddenly)) (VP (VBP hear) (NP (DT a) (JJ loud) (NN sound))))) (, ,) (NP (PRP$ your) (JJ whole) (NN body)) (VP (MD will) (VP (VB jerk))) (. .)))
For example, if you suddenly hear a loud sound, your whole body will jerk.
(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))))))) (. .)))