What's happening?
1-2	What's	_	_	_	_	_	_	_	_
1	What	what	PRON	WP	PronType=Int	3	nsubj	3:nsubj	_
2	's	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	3	aux	3:aux	_
3	happening	happen	VERB	VBG	Tense=Pres|VerbForm=Part	0	root	0:root	SpaceAfter=No
4	?	?	PUNCT	.	_	3	punct	3:punct	_
