must preexchange
Regular verb: preexchange - preexchanged- preexchanged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must preexchange
you must preexchange
he must preexchange
we must preexchange
you must preexchange
they must preexchange 	I must be preexchanging
you must be preexchanging
he must be preexchanging
we must be preexchanging
you must be preexchanging
they must be preexchanging	I must have preexchanged
you must have preexchanged
he must have preexchanged
we must have preexchanged
you must have preexchanged
they must have preexchanged	I must have been preexchanging
you must have been preexchanging
he must have been preexchanging
we must have been preexchanging
you must have been preexchanging
they must have been preexchanging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't preexchange
you mustn't preexchange
he mustn't preexchange
we mustn't preexchange
you mustn't preexchange
they mustn't preexchange 	I mustn't be preexchanging
you mustn't be preexchanging
he mustn't be preexchanging
we mustn't be preexchanging
you mustn't be preexchanging
they mustn't be preexchanging	I mustn't have preexchanged
you mustn't have preexchanged
he mustn't have preexchanged
we mustn't have preexchanged
you mustn't have preexchanged
they mustn't have preexchanged	I mustn't have been preexchanging
you mustn't have been preexchanging
he mustn't have been preexchanging
we mustn't have been preexchanging
you mustn't have been preexchanging
they mustn't have been preexchanging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I preexchange?
must you preexchange?
must he preexchange?
must we preexchange?
must you preexchange?
must they preexchange? 	must I be preexchanging?
must you be preexchanging?
must he be preexchanging?
must we be preexchanging?
must you be preexchanging?
must they be preexchanging? 	must I have preexchanged?
must you have preexchanged?
must he have preexchanged?
must we have preexchanged?
must you have preexchanged?
must they have preexchanged? 	must I have been preexchanging?
must you have been preexchanging?
must he have been preexchanging?
must we have been preexchanging?
must you have been preexchanging?
must they have been preexchanging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I preexchange?
mustn't you preexchange?
mustn't he preexchange?
mustn't we preexchange?
mustn't you preexchange?
mustn't they preexchange? 	mustn't I be preexchanging?
mustn't you be preexchanging?
mustn't he be preexchanging?
mustn't we be preexchanging?
mustn't you be preexchanging?
mustn't they be preexchanging? 	mustn't I have preexchanged?
mustn't you have preexchanged?
mustn't he have preexchanged?
mustn't we have preexchanged?
mustn't you have preexchanged?
mustn't they have preexchanged? 	mustn't I have been preexchanging?
mustn't you have been preexchanging?
mustn't he have been preexchanging?
mustn't we have been preexchanging?
mustn't you have been preexchanging?
mustn't they have been preexchanging?