He didn't mention anything about it.
1	He	he	PRON	PRP	Case=Nom|Gender=Masc|Number=Sing|Person=3|PronType=Prs	4	nsubj	4:nsubj	_
2-3	didn't	_	_	_	_	_	_	_	_
2	did	do	AUX	VBD	Mood=Ind|Number=Sing|Person=3|Tense=Past|VerbForm=Fin	4	aux	4:aux	_
3	n't	not	PART	RB	_	4	advmod	4:advmod	_
4	mention	mention	VERB	VB	VerbForm=Inf	0	root	0:root	_
5	anything	anything	PRON	NN	Number=Sing|PronType=Ind	4	obj	4:obj	_
6	about	about	ADP	IN	_	7	case	7:case	_
7	it	it	PRON	PRP	Case=Acc|Gender=Neut|Number=Sing|Person=3|PronType=Prs	5	nmod	5:nmod:about	SpaceAfter=No
8	.	.	PUNCT	.	_	4	punct	4:punct	_
