Don't tell Grandmother.
1	Do	do	AUX	IMP	Mood=Imp|VerbForm=Fin	3	aux	_	SpaceAfter=No
2	n't	not	PART	NEG	_	3	advmod	_	_
3	tell	tell	VERB	INF	VerbForm=Inf	0	root	_	_
4	Grandmother	grandmother	NOUN	SG	Number=Sing	3	obj	_	SpaceAfter=No
5	.	.	PUNCT	Period	_	3	punct	_	_
