He heard the sound of someone entering the room behind him.
1	He	he	PRON	PERS-P3SG-NOM	Case=Nom|Gender=Masc|Number=Sing|Person=3|PronType=Prs	2	nsubj	_	_
2	heard	hear	VERB	PAST	Mood=Ind|Tense=Past|VerbForm=Fin	0	root	_	_
3	the	the	DET	DEF	Definite=Def|PronType=Art	4	det	_	_
4	sound	sound	NOUN	SG-NOM	Number=Sing	2	obj	_	_
5	of	of	ADP	_	_	7	mark	_	_
6	someone	someone	PRON	IND-SG-NOM	Number=Sing	7	nsubj	_	_
7	entering	enter	VERB	ING	Tense=Pres|VerbForm=Part	4	acl	_	_
8	the	the	DET	DEF	Definite=Def|PronType=Art	9	det	_	_
9	room	room	NOUN	SG-NOM	Number=Sing	7	obj	_	_
10	behind	behind	ADP	_	_	11	case	_	_
11	him	he	PRON	PERS-P3SG-ACC	Case=Acc|Gender=Masc|Number=Sing|Person=3|PronType=Prs	7	obl	_	SpaceAfter=No
12	.	.	PUNCT	Period	_	2	punct	_	_
