Finish it, someone yelled.
( ( Finish it ) ( , ( someone ( yelled . ) ) ) )
(ROOT (S (S (VP (VB Finish) (NP (PRP it)))) (, ,) (NP (NN someone)) (VP (VBD yelled)) (. .)))
Keep going, someone yelled.
( ( Keep going ) ( , ( someone ( yelled . ) ) ) )
(ROOT (S (S (VP (VB Keep) (VP (VBG going)))) (, ,) (NP (NN someone)) (VP (VBD yelled)) (. .)))