He walked out into the street and I followed.
( ( ( ( He ( ( walked out ) ( into ( the street ) ) ) ) and ) ( I followed ) ) . )
(ROOT (S (S (NP (PRP He)) (VP (VBD walked) (PRT (RP out)) (PP (IN into) (NP (DT the) (NN street))))) (CC and) (S (NP (PRP I)) (VP (VBD followed))) (. .)))
I watched him go but didn't follow.
( I ( ( watched ( him ( ( go but ) ( ( did n't ) follow ) ) ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBD watched) (SBAR (S (NP (PRP him)) (VP (VP (VBP go)) (CC but) (VP (VBD did) (RB n't) (VP (VB follow))))))) (. .)))