( ( Not ( all animals ) ) ( ( are ( social animals ) ) . ) )
(ROOT (S (NP (RB Not) (DT all) (NNS animals)) (VP (VBP are) (NP (JJ social) (NNS animals))) (. .)))
Not all animals are social animals.
(ROOT (S (PP (IN For) (NP (JJ social) (NNS animals))) (, ,) (NP (NN communication)) (VP (VBZ essential)) (. .)))