must preassign
Regular verb: preassign - preassigned- preassigned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must preassign
you must preassign
he must preassign
we must preassign
you must preassign
they must preassign 	I must be preassigning
you must be preassigning
he must be preassigning
we must be preassigning
you must be preassigning
they must be preassigning	I must have preassigned
you must have preassigned
he must have preassigned
we must have preassigned
you must have preassigned
they must have preassigned	I must have been preassigning
you must have been preassigning
he must have been preassigning
we must have been preassigning
you must have been preassigning
they must have been preassigning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't preassign
you mustn't preassign
he mustn't preassign
we mustn't preassign
you mustn't preassign
they mustn't preassign 	I mustn't be preassigning
you mustn't be preassigning
he mustn't be preassigning
we mustn't be preassigning
you mustn't be preassigning
they mustn't be preassigning	I mustn't have preassigned
you mustn't have preassigned
he mustn't have preassigned
we mustn't have preassigned
you mustn't have preassigned
they mustn't have preassigned	I mustn't have been preassigning
you mustn't have been preassigning
he mustn't have been preassigning
we mustn't have been preassigning
you mustn't have been preassigning
they mustn't have been preassigning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I preassign?
must you preassign?
must he preassign?
must we preassign?
must you preassign?
must they preassign? 	must I be preassigning?
must you be preassigning?
must he be preassigning?
must we be preassigning?
must you be preassigning?
must they be preassigning? 	must I have preassigned?
must you have preassigned?
must he have preassigned?
must we have preassigned?
must you have preassigned?
must they have preassigned? 	must I have been preassigning?
must you have been preassigning?
must he have been preassigning?
must we have been preassigning?
must you have been preassigning?
must they have been preassigning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I preassign?
mustn't you preassign?
mustn't he preassign?
mustn't we preassign?
mustn't you preassign?
mustn't they preassign? 	mustn't I be preassigning?
mustn't you be preassigning?
mustn't he be preassigning?
mustn't we be preassigning?
mustn't you be preassigning?
mustn't they be preassigning? 	mustn't I have preassigned?
mustn't you have preassigned?
mustn't he have preassigned?
mustn't we have preassigned?
mustn't you have preassigned?
mustn't they have preassigned? 	mustn't I have been preassigning?
mustn't you have been preassigning?
mustn't he have been preassigning?
mustn't we have been preassigning?
mustn't you have been preassigning?
mustn't they have been preassigning?