As he walked up Riverside Drive, he became aware of the fact that he was no longer following Stillman.
1	As	as	SCONJ	_	_	3	mark	_	_
2	he	he	PRON	PERS-P3SG-NOM	Case=Nom|Gender=Masc|Number=Sing|Person=3|PronType=Prs	3	nsubj	_	_
3	walked	walk	VERB	PAST	Mood=Ind|Tense=Past|VerbForm=Fin	9	advcl	_	_
4	up	up	ADP	_	_	5	case	_	_
5	Riverside	Riverside	PROPN	SG-NOM	Number=Sing	3	obl	_	_
6	Drive	drive	NOUN	SG-NOM	Number=Sing	5	flat	_	SpaceAfter=No
7	,	,	PUNCT	Comma	_	3	punct	_	_
8	he	he	PRON	PERS-P3SG-NOM	Case=Nom|Gender=Masc|Number=Sing|Person=3|PronType=Prs	9	nsubj	_	_
9	became	become	VERB	PAST	Mood=Ind|Tense=Past|VerbForm=Fin	0	root	_	_
10	aware	aware	ADJ	POS	Degree=Pos	9	xcomp	_	_
11	of	of	ADP	_	_	13	case	_	_
12	the	the	DET	DEF	Definite=Def|PronType=Art	13	det	_	_
13	fact	fact	NOUN	SG-NOM	Number=Sing	10	nmod	_	_
14	that	that	SCONJ	_	_	19	mark	_	_
15	he	he	PRON	PERS-P3SG-NOM	Case=Nom|Gender=Masc|Number=Sing|Person=3|PronType=Prs	19	nsubj	_	_
16	was	be	AUX	PAST	Mood=Ind|Number=Sing|Person=1|Tense=Past|VerbForm=Fin	19	aux	_	_
17	no	no	ADV	NEG	_	18	advmod	_	_
18	longer	long	ADV	CMP	Degree=Cmp	19	advmod	_	_
19	following	follow	VERB	ING	Tense=Pres|VerbForm=Part	13	acl:relcl	_	_
20	Stillman	Stillman	PROPN	SG-NOM	Number=Sing	19	obj	_	SpaceAfter=No
21	.	.	PUNCT	Period	_	9	punct	_	_
