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))) (. .)))
Add my speculation to the sociologists', said the old man.
( ( ( Add ( my speculation ) ) ( to ( the ( sociologists ' ) ) ) ) ( , ( ( said ( the ( old man ) ) ) . ) ) )
(ROOT (SINV (S (VP (VB Add) (NP (PRP$ my) (NN speculation)) (PP (TO to) (NP (DT the) (NNS sociologists) ('' '))))) (, ,) (VP (VBD said)) (NP (DT the) (JJ old) (NN man)) (. .)))