We do not know what is happening.
1	We	we	PRON	PE	Number=Plur|Person=1|PronType=Prs	4	nsubj	_	_
2	do	do	AUX	VM	Mood=Ind|Number=Plur|Tense=Pres|VerbForm=Fin	4	aux	_	_
3	not	not	PART	PART	Polarity=Neg	2	advmod	_	_
4	know	know	VERB	V	Mood=Ind|Number=Plur|Tense=Pres|VerbForm=Fin	0	root	_	_
5	what	what	PRON	PQ	PronType=Int	7	nsubj	_	_
6	is	be	AUX	VA	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	7	aux	_	_
7	happening	happen	VERB	V	VerbForm=Ger	4	ccomp	_	SpaceAfter=No
8	.	.	PUNCT	FS	_	4	punct	_	_
