(By whom, I don't know.
1	(	(	PUNCT	-LRB-	_	8	punct	8:punct	SpaceAfter=No
2	By	by	ADP	IN	_	3	case	3:case	_
3	whom	whom	PRON	WP	PronType=Int	8	obl	8:obl:by	SpaceAfter=No
4	,	,	PUNCT	,	_	8	punct	8:punct	_
5	I	I	PRON	PRP	Case=Nom|Number=Sing|Person=1|PronType=Prs	8	nsubj	8:nsubj	_
6-7	don't	_	_	_	_	_	_	_	_
6	do	do	AUX	VBP	Mood=Ind|Number=Sing|Person=1|Tense=Pres|VerbForm=Fin	8	aux	8:aux	_
7	n't	not	PART	RB	_	8	advmod	8:advmod	_
8	know	know	VERB	VB	VerbForm=Inf	0	root	0:root	SpaceAfter=No
9	.	.	PUNCT	.	_	8	punct	8:punct	_
