( They ( ( ( ( do not ) easily ) ( ( ( react or ) combine ) ( with ( other elements ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBP do) (RB not) (ADVP (RB easily)) (VP (VB react) (CC or) (VB combine) (PP (IN with) (NP (JJ other) (NNS elements))))) (. .)))
They do not easily react or combine with other elements.
(ROOT (S (NP (JJ Reactive) (NNS elements)) (VP (VBP are) (ADJP (JJ able) (S (VP (TO to) (VP (VB combine) (ADVP (RBR more) (RB easily)) (PP (IN with) (NP (JJ other) (NNS elements)))))))) (. .)))