must smudge
Regular verb: smudge - smudged- smudged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must smudge
you must smudge
she must smudge
we must smudge
you must smudge
they must smudge 	I must be smudging
you must be smudging
she must be smudging
we must be smudging
you must be smudging
they must be smudging	I must have smudged
you must have smudged
she must have smudged
we must have smudged
you must have smudged
they must have smudged	I must have been smudging
you must have been smudging
she must have been smudging
we must have been smudging
you must have been smudging
they must have been smudging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't smudge
you mustn't smudge
she mustn't smudge
we mustn't smudge
you mustn't smudge
they mustn't smudge 	I mustn't be smudging
you mustn't be smudging
she mustn't be smudging
we mustn't be smudging
you mustn't be smudging
they mustn't be smudging	I mustn't have smudged
you mustn't have smudged
she mustn't have smudged
we mustn't have smudged
you mustn't have smudged
they mustn't have smudged	I mustn't have been smudging
you mustn't have been smudging
she mustn't have been smudging
we mustn't have been smudging
you mustn't have been smudging
they mustn't have been smudging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I smudge?
must you smudge?
must she smudge?
must we smudge?
must you smudge?
must they smudge? 	must I be smudging?
must you be smudging?
must she be smudging?
must we be smudging?
must you be smudging?
must they be smudging? 	must I have smudged?
must you have smudged?
must she have smudged?
must we have smudged?
must you have smudged?
must they have smudged? 	must I have been smudging?
must you have been smudging?
must she have been smudging?
must we have been smudging?
must you have been smudging?
must they have been smudging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I smudge?
mustn't you smudge?
mustn't she smudge?
mustn't we smudge?
mustn't you smudge?
mustn't they smudge? 	mustn't I be smudging?
mustn't you be smudging?
mustn't she be smudging?
mustn't we be smudging?
mustn't you be smudging?
mustn't they be smudging? 	mustn't I have smudged?
mustn't you have smudged?
mustn't she have smudged?
mustn't we have smudged?
mustn't you have smudged?
mustn't they have smudged? 	mustn't I have been smudging?
mustn't you have been smudging?
mustn't she have been smudging?
mustn't we have been smudging?
mustn't you have been smudging?
mustn't they have been smudging?