If you don't practice, then nothing happens.
1	If	if	SCONJ	IN	_	5	mark	5:mark	_
2	you	you	PRON	PRP	Case=Nom|Person=2|PronType=Prs	5	nsubj	5:nsubj	_
3-4	don't	_	_	_	_	_	_	_	_
3	do	do	AUX	VBP	Mood=Ind|Number=Sing|Person=2|Tense=Pres|VerbForm=Fin	5	aux	5:aux	_
4	n't	not	PART	RB	_	5	advmod	5:advmod	_
5	practice	practice	VERB	VB	VerbForm=Inf	9	advcl	9:advcl:if	SpaceAfter=No
6	,	,	PUNCT	,	_	9	punct	9:punct	_
7	then	then	ADV	RB	PronType=Dem	9	advmod	9:advmod	_
8	nothing	nothing	PRON	NN	Number=Sing|PronType=Neg	9	nsubj	9:nsubj	_
9	happens	happen	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	0:root	SpaceAfter=No
10	.	.	PUNCT	.	_	9	punct	9:punct	_
