On the other hand, it was possible that Stillman had known all along that he would be watched – had even known it in advance – and therefore had not taken the trouble to discover who the particular watcher was.
1	On	on	ADP	_	_	4	case	_	_
2	the	the	DET	DEF	Definite=Def|PronType=Art	4	det	_	_
3	other	other	ADJ	POS	Degree=Pos	4	amod	_	_
4	hand	hand	NOUN	SG-NOM	Number=Sing	8	nmod	_	SpaceAfter=No
5	,	,	PUNCT	Comma	_	4	punct	_	_
6	it	it	PRON	PERS-SG	_	8	nsubj	_	_
7	was	be	AUX	PAST	Mood=Ind|Number=Sing|Person=1|Tense=Past|VerbForm=Fin	8	cop	_	_
8	possible	possible	ADJ	POS	Degree=Pos	0	root	_	_
9	that	that	SCONJ	_	_	12	mark	_	_
10	Stillman	Stillman	PROPN	SG-NOM	Number=Sing	12	nsubj	_	_
11	had	have	AUX	PAST	Mood=Ind|Tense=Past|VerbForm=Fin	12	aux	_	_
12	known	know	VERB	PERF	Tense=Past|VerbForm=Part	8	ccomp	_	_
13	all	all	ADV	_	_	14	advmod	_	_
14	along	along	ADV	_	_	12	advmod	_	_
15	that	that	SCONJ	_	_	19	mark	_	_
16	he	he	PRON	PERS-P3SG-NOM	Case=Nom|Gender=Masc|Number=Sing|Person=3|PronType=Prs	19	nsubj:pass	_	_
17	would	would	AUX	PAST-AUX	VerbForm=Fin	19	aux	_	_
18	be	be	AUX	INF	VerbForm=Inf	19	aux:pass	_	_
19	watched	watch	VERB	PASS	Tense=Past|VerbForm=Part|Voice=Pass	12	ccomp	_	_
20	–	–	PUNCT	Dash	_	23	punct	_	_
21	had	have	AUX	PAST	Mood=Ind|Tense=Past|VerbForm=Fin	23	aux:pass	_	_
22	even	even	ADV	_	_	23	advmod	_	_
23	known	know	VERB	PASS	Tense=Past|VerbForm=Part|Voice=Pass	12	appos	_	_
24	it	it	PRON	PERS-SG	_	23	obj	_	_
25	in	in	ADP	_	_	26	case	_	_
26	advance	advance	NOUN	SG-NOM	Number=Sing	23	obl	_	_
27	–	–	PUNCT	Dash	_	23	punct	_	_
28	and	and	CCONJ	_	_	32	cc	_	_
29	therefore	therefore	ADV	_	_	32	advmod	_	_
30	had	have	AUX	PAST	Mood=Ind|Tense=Past|VerbForm=Fin	32	aux:pass	_	_
31	not	not	PART	NEG	_	32	advmod	_	_
32	taken	take	VERB	PASS	Tense=Past|VerbForm=Part|Voice=Pass	12	conj	_	_
33	the	the	DET	DEF	Definite=Def|PronType=Art	34	det	_	_
34	trouble	trouble	NOUN	SG-NOM	Number=Sing	32	obj	_	_
35	to	to	PART	_	_	36	mark	_	_
36	discover	discover	VERB	INF	VerbForm=Inf	34	acl	_	_
37	who	who	PRON	WH-NOM	PronType=Int	36	obj	_	_
38	the	the	DET	DEF	Definite=Def|PronType=Art	40	det	_	_
39	particular	particular	ADJ	POS	Degree=Pos	40	amod	_	_
40	watcher	watch	NOUN	SG-NOM	Number=Sing	37	nsubj	_	_
41	was	be	AUX	PAST	Mood=Ind|Number=Sing|Person=1|Tense=Past|VerbForm=Fin	37	cop	_	SpaceAfter=No
42	.	.	PUNCT	Period	_	8	punct	_	_
