Staff exchange has, nonetheless, gained ground and has now become a standard feature of Pericles.
1	Staff	staff	NOUN	S	Number=Sing	2	nmod	_	_
2	exchange	exchange	NOUN	S	Number=Sing	7	nsubj	_	_
3	has	have	AUX	VA	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	7	aux	_	SpaceAfter=No
4	,	,	PUNCT	FF	_	5	punct	_	_
5	nonetheless	nonetheless	ADV	B	_	7	advmod	_	SpaceAfter=No
6	,	,	PUNCT	FF	_	5	punct	_	_
7	gained	gain	VERB	V	Tense=Past|VerbForm=Part	0	root	_	_
8	ground	ground	NOUN	S	Number=Sing	7	obj	_	_
9	and	and	CCONJ	CC	_	12	cc	_	_
10	has	have	AUX	VA	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	12	aux	_	_
11	now	now	ADV	B	_	12	advmod	_	_
12	become	become	VERB	V	Tense=Past|VerbForm=Part	7	conj	_	_
13	a	a	DET	RI	Definite=Ind|Number=Sing|PronType=Art	15	det	_	_
14	standard	standard	ADJ	A	Degree=Pos	15	amod	_	_
15	feature	feature	NOUN	S	Number=Sing	12	obj	_	_
16	of	of	ADP	E	_	17	case	_	_
17	Pericles	Pericles	PROPN	SP	_	15	nmod	_	SpaceAfter=No
18	.	.	PUNCT	FS	_	7	punct	_	_
