Can a policeman open fire on someone trying to kill him?
1	Can	can	AUX	MD	VerbForm=Fin	4	aux	4:aux	_
2	a	a	DET	DT	Definite=Ind|PronType=Art	3	det	3:det	_
3	policeman	policeman	NOUN	NN	Number=Sing	4	nsubj	4:nsubj	_
4	open	open	VERB	VB	VerbForm=Inf	0	root	0:root	_
5	fire	fire	NOUN	NN	Number=Sing	4	obj	4:obj	_
6	on	on	ADP	IN	_	7	case	7:case	_
7	someone	someone	PRON	NN	Number=Sing|PronType=Ind	4	obl	4:obl:on	_
8	trying	try	VERB	VBG	VerbForm=Ger	7	acl	7:acl	_
9	to	to	PART	TO	_	10	mark	10:mark	_
10	kill	kill	VERB	VB	VerbForm=Inf	8	xcomp	8:xcomp	_
11	him	he	PRON	PRP	Case=Acc|Gender=Masc|Number=Sing|Person=3|PronType=Prs	10	obj	10:obj	SpaceAfter=No
12	?	?	PUNCT	.	_	4	punct	4:punct	_
