Certainly I didn't know them.
1	Certainly	certainly	ADV	_	_	5	advmod	_	_
2	I	I	PRON	PERS-P1SG-NOM	Case=Nom|Number=Sing|Person=1|PronType=Prs	5	nsubj	_	_
3	did	do	AUX	PAST-AUX	Mood=Ind|Tense=Past|VerbForm=Fin	5	aux	_	SpaceAfter=No
4	n't	not	PART	NEG	_	5	advmod	_	_
5	know	know	VERB	INF	VerbForm=Inf	0	root	_	_
6	them	they	PRON	PERS-P3PL-ACC	Case=Acc|Number=Plur|Person=3|PronType=Prs	5	obj	_	SpaceAfter=No
7	.	.	PUNCT	Period	_	5	punct	_	_
