They are merely imposters.
1	They	they	PRON	PRP	Case=Nom|Number=Plur|Person=3|PronType=Prs	4	nsubj	4:nsubj	_
2	are	be	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	4	cop	4:cop	_
3	merely	merely	ADV	RB	_	4	advmod	4:advmod	_
4	imposters	imposter	NOUN	NNS	Number=Plur	0	root	0:root	SpaceAfter=No
5	.	.	PUNCT	.	_	4	punct	4:punct	_
