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))))))))) (. .)))
There is no interest by toddlers to talk about what people do.
( There ( ( is ( ( no interest ) ( by ( toddlers ( to ( talk ( about ( what ( people do ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (EX There)) (VP (VBZ is) (NP (NP (DT no) (NN interest)) (PP (IN by) (NP (NNS toddlers) (S (VP (TO to) (VP (VB talk) (PP (IN about) (SBAR (WHNP (WP what)) (S (NP (NNS people)) (VP (VBP do)))))))))))) (. .)))