When toddlers begin to speak, their main interest is in talking about what people do and the consequences of their behavior.
( ( When ( toddlers ( begin ( to speak ) ) ) ) ( , ( ( their ( main interest ) ) ( ( is ( in ( talking ( ( ( ( about what ) ( people do ) ) and ) ( ( the consequences ) ( of ( their behavior ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (NNS toddlers)) (VP (VBP begin) (S (VP (TO to) (VP (VB speak))))))) (, ,) (NP (PRP$ their) (JJ main) (NN interest)) (VP (VBZ is) (PP (IN in) (S (VP (VBG talking) (NP (NP (SBAR (WHPP (IN about) (WHNP (WP what))) (S (NP (NNS people)) (VP (VBP do))))) (CC and) (NP (NP (DT the) (NNS consequences)) (PP (IN of) (NP (PRP$ their) (NN behavior))))))))) (. .)))
When the children talk, they are interested in talking about the things people do.
( ( When ( ( the children ) talk ) ) ( , ( they ( ( are ( interested ( in ( talking ( about ( ( the things ) ( people do ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (DT the) (NNS children)) (VP (VBP talk)))) (, ,) (NP (PRP they)) (VP (VBP are) (ADJP (JJ interested) (PP (IN in) (S (VP (VBG talking) (PP (IN about) (NP (NP (DT the) (NNS things)) (SBAR (S (NP (NNS people)) (VP (VBP do))))))))))) (. .)))