Then I considered.
( Then ( I ( considered . ) ) )
(ROOT (S (RB Then) (NP (PRP I)) (VP (VBD considered)) (. .)))
Afterwards, I thought about it.
( Afterwards ( , ( I ( ( thought ( about it ) ) . ) ) ) )
(ROOT (S (ADVP (RB Afterwards)) (, ,) (NP (PRP I)) (VP (VBD thought) (PP (IN about) (NP (PRP it)))) (. .)))