( Solids ( ( ( have ( definite ( ( shapes and ) volumes ) ) ) ( because ( ( their ( ( atoms and ) molecules ) ) ( are ( ( ( held together ) firmly ) ( by ( the ( strong ( inter-molecular forces ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Solids)) (VP (VBP have) (NP (JJ definite) (NNS shapes) (CC and) (NNS volumes)) (SBAR (IN because) (S (NP (PRP$ their) (NNS atoms) (CC and) (NNS molecules)) (VP (VBP are) (VP (VBN held) (PRT (RP together)) (ADVP (RB firmly)) (PP (IN by) (NP (DT the) (JJ strong) (JJ inter-molecular) (NNS forces)))))))) (. .)))
Solids have definite shapes and volumes because their atoms and molecules are held together firmly by the strong inter-molecular forces.
(ROOT (S (NP (NNP Solid)) (VP (VBZ is) (NP (NP (DT a) (NN form)) (PP (IN of) (NP (NN matter))) (SBAR (WHNP (WDT that)) (S (VP (VBZ has) (NP (NP (DT a) (JJ definite) (NN shape)) (CC and) (NP (NN volume)))))))) (. .)))