must shellac
Regular verb: shellac - shellaced- shellaced

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must shellac
you must shellac
she must shellac
we must shellac
you must shellac
they must shellac 	I must be shellacing
you must be shellacing
she must be shellacing
we must be shellacing
you must be shellacing
they must be shellacing	I must have shellaced
you must have shellaced
she must have shellaced
we must have shellaced
you must have shellaced
they must have shellaced	I must have been shellacing
you must have been shellacing
she must have been shellacing
we must have been shellacing
you must have been shellacing
they must have been shellacing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't shellac
you mustn't shellac
she mustn't shellac
we mustn't shellac
you mustn't shellac
they mustn't shellac 	I mustn't be shellacing
you mustn't be shellacing
she mustn't be shellacing
we mustn't be shellacing
you mustn't be shellacing
they mustn't be shellacing	I mustn't have shellaced
you mustn't have shellaced
she mustn't have shellaced
we mustn't have shellaced
you mustn't have shellaced
they mustn't have shellaced	I mustn't have been shellacing
you mustn't have been shellacing
she mustn't have been shellacing
we mustn't have been shellacing
you mustn't have been shellacing
they mustn't have been shellacing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I shellac?
must you shellac?
must she shellac?
must we shellac?
must you shellac?
must they shellac? 	must I be shellacing?
must you be shellacing?
must she be shellacing?
must we be shellacing?
must you be shellacing?
must they be shellacing? 	must I have shellaced?
must you have shellaced?
must she have shellaced?
must we have shellaced?
must you have shellaced?
must they have shellaced? 	must I have been shellacing?
must you have been shellacing?
must she have been shellacing?
must we have been shellacing?
must you have been shellacing?
must they have been shellacing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I shellac?
mustn't you shellac?
mustn't she shellac?
mustn't we shellac?
mustn't you shellac?
mustn't they shellac? 	mustn't I be shellacing?
mustn't you be shellacing?
mustn't she be shellacing?
mustn't we be shellacing?
mustn't you be shellacing?
mustn't they be shellacing? 	mustn't I have shellaced?
mustn't you have shellaced?
mustn't she have shellaced?
mustn't we have shellaced?
mustn't you have shellaced?
mustn't they have shellaced? 	mustn't I have been shellacing?
mustn't you have been shellacing?
mustn't she have been shellacing?
mustn't we have been shellacing?
mustn't you have been shellacing?
mustn't they have been shellacing?