must prealter
Regular verb: prealter - prealtered- prealtered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must prealter
you must prealter
she must prealter
we must prealter
you must prealter
they must prealter 	I must be prealtering
you must be prealtering
she must be prealtering
we must be prealtering
you must be prealtering
they must be prealtering	I must have prealtered
you must have prealtered
she must have prealtered
we must have prealtered
you must have prealtered
they must have prealtered	I must have been prealtering
you must have been prealtering
she must have been prealtering
we must have been prealtering
you must have been prealtering
they must have been prealtering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't prealter
you mustn't prealter
she mustn't prealter
we mustn't prealter
you mustn't prealter
they mustn't prealter 	I mustn't be prealtering
you mustn't be prealtering
she mustn't be prealtering
we mustn't be prealtering
you mustn't be prealtering
they mustn't be prealtering	I mustn't have prealtered
you mustn't have prealtered
she mustn't have prealtered
we mustn't have prealtered
you mustn't have prealtered
they mustn't have prealtered	I mustn't have been prealtering
you mustn't have been prealtering
she mustn't have been prealtering
we mustn't have been prealtering
you mustn't have been prealtering
they mustn't have been prealtering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I prealter?
must you prealter?
must she prealter?
must we prealter?
must you prealter?
must they prealter? 	must I be prealtering?
must you be prealtering?
must she be prealtering?
must we be prealtering?
must you be prealtering?
must they be prealtering? 	must I have prealtered?
must you have prealtered?
must she have prealtered?
must we have prealtered?
must you have prealtered?
must they have prealtered? 	must I have been prealtering?
must you have been prealtering?
must she have been prealtering?
must we have been prealtering?
must you have been prealtering?
must they have been prealtering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I prealter?
mustn't you prealter?
mustn't she prealter?
mustn't we prealter?
mustn't you prealter?
mustn't they prealter? 	mustn't I be prealtering?
mustn't you be prealtering?
mustn't she be prealtering?
mustn't we be prealtering?
mustn't you be prealtering?
mustn't they be prealtering? 	mustn't I have prealtered?
mustn't you have prealtered?
mustn't she have prealtered?
mustn't we have prealtered?
mustn't you have prealtered?
mustn't they have prealtered? 	mustn't I have been prealtering?
mustn't you have been prealtering?
mustn't she have been prealtering?
mustn't we have been prealtering?
mustn't you have been prealtering?
mustn't they have been prealtering?