I don't know if I should call him again tomorrow or not?
1	I	I	PRON	PRP	Case=Nom|Number=Sing|Person=1|PronType=Prs	4	nsubj	4:nsubj	_
2-3	don't	_	_	_	_	_	_	_	_
2	do	do	AUX	VBP	Mood=Ind|Number=Sing|Person=1|Tense=Pres|VerbForm=Fin	4	aux	4:aux	_
3	n't	not	PART	RB	_	4	advmod	4:advmod	_
4	know	know	VERB	VB	VerbForm=Inf	0	root	0:root	_
5	if	if	SCONJ	IN	_	8	mark	8:mark	_
6	I	I	PRON	PRP	Case=Nom|Number=Sing|Person=1|PronType=Prs	8	nsubj	8:nsubj|13:nsubj	_
7	should	should	AUX	MD	VerbForm=Fin	8	aux	8:aux	_
8	call	call	VERB	VB	VerbForm=Inf	4	advcl	4:advcl:if	_
9	him	he	PRON	PRP	Case=Acc|Gender=Masc|Number=Sing|Person=3|PronType=Prs	8	obj	8:obj	_
10	again	again	ADV	RB	_	8	advmod	8:advmod	_
11	tomorrow	tomorrow	NOUN	NN	Number=Sing	8	obl:tmod	8:obl:tmod	_
12	or	or	CCONJ	CC	_	13	cc	13:cc	_
13	not	not	PART	RB	_	8	conj	4:advcl:if|8:conj:or	SpaceAfter=No
14	?	?	PUNCT	.	_	4	punct	4:punct	_
