must halve
Regular verb: halve - halved- halved

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must halve
you must halve
he must halve
we must halve
you must halve
they must halve 	I must be halving
you must be halving
he must be halving
we must be halving
you must be halving
they must be halving	I must have halved
you must have halved
he must have halved
we must have halved
you must have halved
they must have halved	I must have been halving
you must have been halving
he must have been halving
we must have been halving
you must have been halving
they must have been halving	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't halve
you mustn't halve
he mustn't halve
we mustn't halve
you mustn't halve
they mustn't halve 	I mustn't be halving
you mustn't be halving
he mustn't be halving
we mustn't be halving
you mustn't be halving
they mustn't be halving	I mustn't have halved
you mustn't have halved
he mustn't have halved
we mustn't have halved
you mustn't have halved
they mustn't have halved	I mustn't have been halving
you mustn't have been halving
he mustn't have been halving
we mustn't have been halving
you mustn't have been halving
they mustn't have been halving	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I halve?
must you halve?
must he halve?
must we halve?
must you halve?
must they halve? 	must I be halving?
must you be halving?
must he be halving?
must we be halving?
must you be halving?
must they be halving? 	must I have halved?
must you have halved?
must he have halved?
must we have halved?
must you have halved?
must they have halved? 	must I have been halving?
must you have been halving?
must he have been halving?
must we have been halving?
must you have been halving?
must they have been halving? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I halve?
mustn't you halve?
mustn't he halve?
mustn't we halve?
mustn't you halve?
mustn't they halve? 	mustn't I be halving?
mustn't you be halving?
mustn't he be halving?
mustn't we be halving?
mustn't you be halving?
mustn't they be halving? 	mustn't I have halved?
mustn't you have halved?
mustn't he have halved?
mustn't we have halved?
mustn't you have halved?
mustn't they have halved? 	mustn't I have been halving?
mustn't you have been halving?
mustn't he have been halving?
mustn't we have been halving?
mustn't you have been halving?
mustn't they have been halving?