We're at war . . . somebody's going to pay.
( ( ( ( We ( 're ( at war ) ) ) ... ) ( somebody ( 's ( going ( to pay ) ) ) ) ) . )
(ROOT (S (S (NP (PRP We)) (VP (VBP 're) (PP (IN at) (NP (NN war))))) (: ...) (S (NP (NN somebody)) (VP (VBZ 's) (VP (VBG going) (S (VP (TO to) (VP (VB pay))))))) (. .)))
We are going to get back at them.
( We ( ( are ( going ( to ( ( get back ) ( at them ) ) ) ) ) . ) )
(ROOT (S (NP (PRP We)) (VP (VBP are) (VP (VBG going) (S (VP (TO to) (VP (VB get) (PRT (RP back)) (PP (IN at) (NP (PRP them)))))))) (. .)))