He returned to Afghanistan.
( He ( ( returned ( to Afghanistan ) ) . ) )
(ROOT (S (NP (PRP He)) (VP (VBD returned) (PP (TO to) (NP (NNP Afghanistan)))) (. .)))
He never went back to Afghanistan.
( He ( never ( ( ( went back ) ( to Afghanistan ) ) . ) ) )
(ROOT (S (NP (PRP He)) (ADVP (RB never)) (VP (VBD went) (ADVP (RB back)) (PP (TO to) (NP (NNP Afghanistan)))) (. .)))