Shakespeare's plays are difficult to date, however, and studies of the texts suggest that Titus Andronicus, The Comedy of Errors, The Taming of the Shrew and The Two Gentlemen of Verona may also belong to Shakespeare's earliest period.
1	Shakespeare	Shakespeare	PROPN	SP	_	3	nmod	_	SpaceAfter=No
2	's	's	PART	PART	_	1	case	_	_
3	plays	play	NOUN	S	Number=Plur	5	nsubj	_	_
4	are	be	AUX	V	Mood=Ind|Number=Plur|Tense=Pres|VerbForm=Fin	5	cop	_	_
5	difficult	difficult	ADJ	A	Degree=Pos	0	root	_	_
6	to	to	PART	PART	_	7	mark	_	_
7	date	date	VERB	V	VerbForm=Inf	5	advcl	_	SpaceAfter=No
8	,	,	PUNCT	FF	_	5	punct	_	_
9	however	however	ADV	B	_	5	advmod	_	SpaceAfter=No
10	,	,	PUNCT	FF	_	9	punct	_	_
11	and	and	CCONJ	CC	_	16	cc	_	_
12	studies	study	VERB	V	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	16	csubj	_	_
13	of	of	ADP	E	_	15	case	_	_
14	the	the	DET	RD	Definite=Def|PronType=Art	15	det	_	_
15	texts	text	NOUN	S	Number=Plur	12	obl	_	_
16	suggest	suggest	VERB	V	Mood=Ind|Number=Plur|Tense=Pres|VerbForm=Fin	5	conj	_	_
17	that	that	SCONJ	CS	_	39	mark	_	_
18	Titus	Titus	PROPN	SP	_	39	nsubj	_	_
19	Andronicus	Andronicus	PROPN	SP	_	18	flat	_	SpaceAfter=No
20	,	,	PUNCT	FF	_	22	punct	_	_
21	The	the	DET	RD	Definite=Def|PronType=Art	22	det	_	_
22	Comedy	comedy	NOUN	S	Number=Sing	18	conj	_	_
23	of	of	ADP	E	_	24	case	_	_
24	Errors	Errors	PROPN	SP	_	22	nmod	_	SpaceAfter=No
25	,	,	PUNCT	FF	_	27	punct	_	_
26	The	the	DET	RD	Definite=Def|PronType=Art	27	det	_	_
27	Taming	Taming	PROPN	SP	_	18	conj	_	_
28	of	of	ADP	E	_	30	case	_	_
29	the	the	DET	RD	Definite=Def|PronType=Art	30	det	_	_
30	Shrew	shrew	NOUN	S	Number=Sing	27	nmod	_	_
31	and	and	CCONJ	CC	_	34	cc	_	_
32	The	the	DET	RD	Definite=Def|PronType=Art	34	det	_	_
33	Two	two	NUM	N	NumType=Card	34	nummod	_	_
34	Gentlemen	Gentlemen	PROPN	SP	_	18	conj	_	_
35	of	of	ADP	E	_	36	case	_	_
36	Verona	Verona	PROPN	SP	_	34	nmod	_	_
37	may	may	AUX	VM	Mood=Ind|Person=3|Tense=Pres|VerbForm=Fin	39	aux	_	_
38	also	also	ADV	B	_	39	advmod	_	_
39	belong	belong	VERB	V	VerbForm=Inf	16	ccomp	_	_
40	to	to	ADP	E	_	44	case	_	_
41	Shakespeare	Shakespeare	PROPN	SP	_	44	nmod	_	SpaceAfter=No
42	's	's	PART	PART	_	41	case	_	_
43	earliest	earliest	ADJ	A	Degree=Sup	44	amod	_	_
44	period	period	NOUN	S	Number=Sing	39	obl	_	SpaceAfter=No
45	.	.	PUNCT	FS	_	5	punct	_	_
