they had contributed to the arrangements for this party.
1	they	they	PRON	PERS-PL-NOM	Case=Nom|Number=Plur|Person=3|PronType=Prs	3	nsubj	_	_
2	had	have	AUX	PAST-AUX	Mood=Ind|Tense=Past|VerbForm=Fin	3	aux	_	_
3	contributed	contribute	VERB	PERF	Tense=Past|VerbForm=Part	0	root	_	_
4	to	to	ADP	_	_	6	case	_	_
5	the	the	DET	DEF	Definite=Def|PronType=Art	6	det	_	_
6	arrangements	arrangement	NOUN	PL-NOM	Number=Plur	3	obl	_	_
7	for	for	ADP	_	_	9	case	_	_
8	this	this	DET	DEM-SG	Number=Sing|PronType=Dem	9	det	_	_
9	party	party	NOUN	SG-NOM	Number=Sing	6	nmod	_	SpaceAfter=No
10	.	.	PUNCT	Period	_	3	punct	_	_
