must proportion
Regular verb: proportion - proportioned- proportioned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must proportion
you must proportion
he must proportion
we must proportion
you must proportion
they must proportion 	I must be proportioning
you must be proportioning
he must be proportioning
we must be proportioning
you must be proportioning
they must be proportioning	I must have proportioned
you must have proportioned
he must have proportioned
we must have proportioned
you must have proportioned
they must have proportioned	I must have been proportioning
you must have been proportioning
he must have been proportioning
we must have been proportioning
you must have been proportioning
they must have been proportioning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't proportion
you mustn't proportion
he mustn't proportion
we mustn't proportion
you mustn't proportion
they mustn't proportion 	I mustn't be proportioning
you mustn't be proportioning
he mustn't be proportioning
we mustn't be proportioning
you mustn't be proportioning
they mustn't be proportioning	I mustn't have proportioned
you mustn't have proportioned
he mustn't have proportioned
we mustn't have proportioned
you mustn't have proportioned
they mustn't have proportioned	I mustn't have been proportioning
you mustn't have been proportioning
he mustn't have been proportioning
we mustn't have been proportioning
you mustn't have been proportioning
they mustn't have been proportioning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I proportion?
must you proportion?
must he proportion?
must we proportion?
must you proportion?
must they proportion? 	must I be proportioning?
must you be proportioning?
must he be proportioning?
must we be proportioning?
must you be proportioning?
must they be proportioning? 	must I have proportioned?
must you have proportioned?
must he have proportioned?
must we have proportioned?
must you have proportioned?
must they have proportioned? 	must I have been proportioning?
must you have been proportioning?
must he have been proportioning?
must we have been proportioning?
must you have been proportioning?
must they have been proportioning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I proportion?
mustn't you proportion?
mustn't he proportion?
mustn't we proportion?
mustn't you proportion?
mustn't they proportion? 	mustn't I be proportioning?
mustn't you be proportioning?
mustn't he be proportioning?
mustn't we be proportioning?
mustn't you be proportioning?
mustn't they be proportioning? 	mustn't I have proportioned?
mustn't you have proportioned?
mustn't he have proportioned?
mustn't we have proportioned?
mustn't you have proportioned?
mustn't they have proportioned? 	mustn't I have been proportioning?
mustn't you have been proportioning?
mustn't he have been proportioning?
mustn't we have been proportioning?
mustn't you have been proportioning?
mustn't they have been proportioning?