# sent_id 1
# ...
1	They	they	PRON	PRP	Case=Nom|Number=Plur	2	nsubj	4:nsubj	_
2	buy	buy	VERB	VBP	Number=Plur|Person=3|Tense=Pres	0	root	_	_
3	and	and	CONJ	CC	_	2	cc	_	_
4	sell	sell	VERB	VBP	Number=Plur|Person=3|Tense=Pres	2	conj	0:root	_
5	books	book	NOUN	NNS	Number=Plur	2	dobj	4:dobj	SpaceAfter=No
6	.	.	PUNCT	.	_	2	punct	_	_