must prefreeze
Regular verb: prefreeze - prefreezed- prefreezed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must prefreeze
you must prefreeze
he must prefreeze
we must prefreeze
you must prefreeze
they must prefreeze 	I must be prefreezing
you must be prefreezing
he must be prefreezing
we must be prefreezing
you must be prefreezing
they must be prefreezing	I must have prefreezed
you must have prefreezed
he must have prefreezed
we must have prefreezed
you must have prefreezed
they must have prefreezed	I must have been prefreezing
you must have been prefreezing
he must have been prefreezing
we must have been prefreezing
you must have been prefreezing
they must have been prefreezing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't prefreeze
you mustn't prefreeze
he mustn't prefreeze
we mustn't prefreeze
you mustn't prefreeze
they mustn't prefreeze 	I mustn't be prefreezing
you mustn't be prefreezing
he mustn't be prefreezing
we mustn't be prefreezing
you mustn't be prefreezing
they mustn't be prefreezing	I mustn't have prefreezed
you mustn't have prefreezed
he mustn't have prefreezed
we mustn't have prefreezed
you mustn't have prefreezed
they mustn't have prefreezed	I mustn't have been prefreezing
you mustn't have been prefreezing
he mustn't have been prefreezing
we mustn't have been prefreezing
you mustn't have been prefreezing
they mustn't have been prefreezing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I prefreeze?
must you prefreeze?
must he prefreeze?
must we prefreeze?
must you prefreeze?
must they prefreeze? 	must I be prefreezing?
must you be prefreezing?
must he be prefreezing?
must we be prefreezing?
must you be prefreezing?
must they be prefreezing? 	must I have prefreezed?
must you have prefreezed?
must he have prefreezed?
must we have prefreezed?
must you have prefreezed?
must they have prefreezed? 	must I have been prefreezing?
must you have been prefreezing?
must he have been prefreezing?
must we have been prefreezing?
must you have been prefreezing?
must they have been prefreezing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I prefreeze?
mustn't you prefreeze?
mustn't he prefreeze?
mustn't we prefreeze?
mustn't you prefreeze?
mustn't they prefreeze? 	mustn't I be prefreezing?
mustn't you be prefreezing?
mustn't he be prefreezing?
mustn't we be prefreezing?
mustn't you be prefreezing?
mustn't they be prefreezing? 	mustn't I have prefreezed?
mustn't you have prefreezed?
mustn't he have prefreezed?
mustn't we have prefreezed?
mustn't you have prefreezed?
mustn't they have prefreezed? 	mustn't I have been prefreezing?
mustn't you have been prefreezing?
mustn't he have been prefreezing?
mustn't we have been prefreezing?
mustn't you have been prefreezing?
mustn't they have been prefreezing?