But, I guess, it's a start...
1	But	but	CCONJ	CC	_	4	cc	4:cc	SpaceAfter=No
2	,	,	PUNCT	,	_	4	punct	4:punct	_
3	I	I	PRON	PRP	Case=Nom|Number=Sing|Person=1|PronType=Prs	4	nsubj	4:nsubj	_
4	guess	guess	VERB	VBP	Mood=Ind|Number=Sing|Person=1|Tense=Pres|VerbForm=Fin	0	root	0:root	SpaceAfter=No
5	,	,	PUNCT	,	_	4	punct	4:punct	_
6-7	it's	_	_	_	_	_	_	_	_
6	it	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	9	nsubj	9:nsubj	_
7	's	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	9	cop	9:cop	_
8	a	a	DET	DT	Definite=Ind|PronType=Art	9	det	9:det	_
9	start	start	NOUN	NN	Number=Sing	4	ccomp	4:ccomp	SpaceAfter=No
10	...	...	PUNCT	.	_	4	punct	4:punct	_
