They already are altering their patterns of behavior in response to what is happening.
1	They	they	PRON	PRP	Case=Nom|Number=Plur|Person=3|PronType=Prs	4	nsubj	4:nsubj	_
2	already	already	ADV	RB	_	4	advmod	4:advmod	_
3	are	be	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	4	aux	4:aux	_
4	altering	alter	VERB	VBG	VerbForm=Ger	0	root	0:root	_
5	their	their	PRON	PRP$	Case=Gen|Number=Plur|Person=3|Poss=Yes|PronType=Prs	6	nmod:poss	6:nmod:poss	_
6	patterns	pattern	NOUN	NNS	Number=Plur	4	obj	4:obj	_
7	of	of	ADP	IN	_	8	case	8:case	_
8	behavior	behavior	NOUN	NN	Number=Sing	6	nmod	6:nmod:of	_
9	in	in	ADP	IN	_	10	case	10:case	_
10	response	response	NOUN	NN	Number=Sing	4	obl	4:obl:in	_
11	to	to	SCONJ	IN	_	14	mark	14:mark	_
12	what	what	PRON	WP	PronType=Int	14	nsubj	14:nsubj	_
13	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	14	aux	14:aux	_
14	happening	happen	VERB	VBG	VerbForm=Ger	10	acl	10:acl:to	SpaceAfter=No
15	.	.	PUNCT	.	_	4	punct	4:punct	_
