must preacquaint
Regular verb: preacquaint - preacquainted- preacquainted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must preacquaint
you must preacquaint
she must preacquaint
we must preacquaint
you must preacquaint
they must preacquaint 	I must be preacquainting
you must be preacquainting
she must be preacquainting
we must be preacquainting
you must be preacquainting
they must be preacquainting	I must have preacquainted
you must have preacquainted
she must have preacquainted
we must have preacquainted
you must have preacquainted
they must have preacquainted	I must have been preacquainting
you must have been preacquainting
she must have been preacquainting
we must have been preacquainting
you must have been preacquainting
they must have been preacquainting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't preacquaint
you mustn't preacquaint
she mustn't preacquaint
we mustn't preacquaint
you mustn't preacquaint
they mustn't preacquaint 	I mustn't be preacquainting
you mustn't be preacquainting
she mustn't be preacquainting
we mustn't be preacquainting
you mustn't be preacquainting
they mustn't be preacquainting	I mustn't have preacquainted
you mustn't have preacquainted
she mustn't have preacquainted
we mustn't have preacquainted
you mustn't have preacquainted
they mustn't have preacquainted	I mustn't have been preacquainting
you mustn't have been preacquainting
she mustn't have been preacquainting
we mustn't have been preacquainting
you mustn't have been preacquainting
they mustn't have been preacquainting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I preacquaint?
must you preacquaint?
must she preacquaint?
must we preacquaint?
must you preacquaint?
must they preacquaint? 	must I be preacquainting?
must you be preacquainting?
must she be preacquainting?
must we be preacquainting?
must you be preacquainting?
must they be preacquainting? 	must I have preacquainted?
must you have preacquainted?
must she have preacquainted?
must we have preacquainted?
must you have preacquainted?
must they have preacquainted? 	must I have been preacquainting?
must you have been preacquainting?
must she have been preacquainting?
must we have been preacquainting?
must you have been preacquainting?
must they have been preacquainting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I preacquaint?
mustn't you preacquaint?
mustn't she preacquaint?
mustn't we preacquaint?
mustn't you preacquaint?
mustn't they preacquaint? 	mustn't I be preacquainting?
mustn't you be preacquainting?
mustn't she be preacquainting?
mustn't we be preacquainting?
mustn't you be preacquainting?
mustn't they be preacquainting? 	mustn't I have preacquainted?
mustn't you have preacquainted?
mustn't she have preacquainted?
mustn't we have preacquainted?
mustn't you have preacquainted?
mustn't they have preacquainted? 	mustn't I have been preacquainting?
mustn't you have been preacquainting?
mustn't she have been preacquainting?
mustn't we have been preacquainting?
mustn't you have been preacquainting?
mustn't they have been preacquainting?