To the sociologists' speculations, add mine.
( ( To ( the ( sociologists ( ' speculations ) ) ) ) ( , ( ( add mine ) . ) ) )
(ROOT (S (PP (TO To) (NP (DT the) (NNP sociologists) ('' ') (NNS speculations))) (, ,) (VP (VB add) (NP (NN mine))) (. .)))
I don't agree with sociologists.
( I ( ( ( do n't ) ( agree ( with sociologists ) ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBP do) (RB n't) (VP (VB agree) (PP (IN with) (NP (NNS sociologists))))) (. .)))