They would know.
1	They	they	PRON	PRP	Case=Nom|Number=Plur|Person=3|PronType=Prs	3	nsubj	3:nsubj	_
2	would	would	AUX	MD	VerbForm=Fin	3	aux	3:aux	_
3	know	know	VERB	VB	VerbForm=Inf	0	root	0:root	SpaceAfter=No
4	.	.	PUNCT	.	_	3	punct	3:punct	_
