The doctor begs them to stop intermarrying but they say they have to keep the blood pure.
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	2:det	_
2	doctor	doctor	NOUN	NN	Number=Sing	3	nsubj	3:nsubj	_
3	begs	beg	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	0:root	_
4	them	they	PRON	PRP	Case=Acc|Number=Plur|Person=3|PronType=Prs	3	obj	3:obj|6:nsubj:xsubj|7:nsubj:xsubj	_
5	to	to	PART	TO	_	6	mark	6:mark	_
6	stop	stop	VERB	VB	VerbForm=Inf	3	xcomp	3:xcomp	_
7	intermarrying	intermarry	VERB	VBG	VerbForm=Ger	6	xcomp	6:xcomp	_
8	but	but	CCONJ	CC	_	10	cc	10:cc	_
9	they	they	PRON	PRP	Case=Nom|Number=Plur|Person=3|PronType=Prs	10	nsubj	10:nsubj	_
10	say	say	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	3	conj	3:conj:but	_
11	they	they	PRON	PRP	Case=Nom|Number=Plur|Person=3|PronType=Prs	12	nsubj	12:nsubj|14:nsubj:xsubj	_
12	have	have	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	10	ccomp	10:ccomp	_
13	to	to	PART	TO	_	14	mark	14:mark	_
14	keep	keep	VERB	VB	VerbForm=Inf	12	xcomp	12:xcomp	_
15	the	the	DET	DT	Definite=Def|PronType=Art	16	det	16:det	_
16	blood	blood	NOUN	NN	Number=Sing	14	obj	14:obj|17:nsubj:xsubj	_
17	pure	pure	ADJ	JJ	Degree=Pos	14	xcomp	14:xcomp	SpaceAfter=No
18	.	.	PUNCT	.	_	3	punct	3:punct	_
