They started to haggle.
1	They	they	PRON	PERS-PL-NOM	Case=Nom|Number=Plur|Person=3|PronType=Prs	2	nsubj	_	_
2	started	start	VERB	PAST	Mood=Ind|Tense=Past|VerbForm=Fin	0	root	_	_
3	to	to	PART	_	_	4	mark	_	_
4	haggle	haggle	VERB	INF	VerbForm=Inf	2	xcomp	_	SpaceAfter=No
5	.	.	PUNCT	Period	_	2	punct	_	_
