It was a man who opened the apartment door.
1	It	it	PRON	PERS-SG	_	4	expl	_	_
2	was	be	AUX	PAST	Mood=Ind|Number=Sing|Person=1|Tense=Past|VerbForm=Fin	4	cop	_	_
3	a	a	DET	IND-SG	Definite=Ind|PronType=Art	4	det	_	_
4	man	man	NOUN	SG-NOM	Number=Sing	0	root	_	_
5	who	who	PRON	WH-REL	PronType=Rel	6	nsubj	_	_
6	opened	opened	VERB	PAST	Mood=Ind|Tense=Past|VerbForm=Fin	4	csubj	_	_
7	the	the	DET	DEF	Definite=Def|PronType=Art	9	det	_	_
8	apartment	apartment	NOUN	SG-NOM	Number=Sing	9	compound	_	_
9	door	door	NOUN	SG-NOM	Number=Sing	6	obj	_	SpaceAfter=No
10	.	.	PUNCT	Period	_	4	punct	_	_
