he knew at once where he was.
1	he	he	PRON	PERS-P3SG-NOM	Case=Nom|Gender=Masc|Number=Sing|Person=3|PronType=Prs	2	nsubj	_	_
2	knew	know	VERB	PAST	Mood=Ind|Tense=Past|VerbForm=Fin	0	root	_	_
3	at	at	ADV	_	_	2	advmod	_	_
4	once	once	ADV	_	NumType=Mult	3	fixed	_	_
5	where	where	ADV	WH	PronType=Int	7	advmod	_	_
6	he	he	PRON	PERS-P3SG-NOM	Case=Nom|Gender=Masc|Number=Sing|Person=3|PronType=Prs	7	nsubj	_	_
7	was	be	VERB	PAST	Mood=Ind|Number=Sing|Person=1|Tense=Past|VerbForm=Fin	2	ccomp	_	SpaceAfter=No
8	.	.	PUNCT	Period	_	2	punct	_	_
