( ( Emphasize ( ( ( that ( gases ( have ( ( ( neither ( definite volume ) ) nor ) ( definite shape ) ) ) ) ) and ) ( that ( they ( tend ( to ( ( fill up ) ( whatever ( space ( is ( available ( to them ) ) ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (VP (VB Emphasize) (SBAR (SBAR (IN that) (S (NP (NNS gases)) (VP (VBP have) (NP (NP (DT neither) (JJ definite) (NN volume)) (CC nor) (NP (JJ definite) (NN shape)))))) (CC and) (SBAR (IN that) (S (NP (PRP they)) (VP (VBP tend) (S (VP (TO to) (VP (VB fill) (PRT (RP up)) (SBAR (WHNP (WDT whatever)) (S (NP (NN space)) (VP (VBZ is) (ADJP (JJ available) (PP (TO to) (NP (PRP them))))))))))))))) (. .)))
Emphasize that gases have neither definite volume nor definite shape and that they tend to fill up whatever space is available to them.
(ROOT (S (NP (NP (DT The) (NN gas) (NN form)) (PP (IN of) (NP (NN matter)))) (VP (VBZ has) (NP (NP (ADVP (DT neither)) (DT a) (JJ definite) (NN shape)) (CC nor) (NP (DT a) (JJ definite) (NN volume)))) (. .)))