must neuter
Regular verb: neuter - neutered- neutered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must neuter
you must neuter
he must neuter
we must neuter
you must neuter
they must neuter 	I must be neutering
you must be neutering
he must be neutering
we must be neutering
you must be neutering
they must be neutering	I must have neutered
you must have neutered
he must have neutered
we must have neutered
you must have neutered
they must have neutered	I must have been neutering
you must have been neutering
he must have been neutering
we must have been neutering
you must have been neutering
they must have been neutering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't neuter
you mustn't neuter
he mustn't neuter
we mustn't neuter
you mustn't neuter
they mustn't neuter 	I mustn't be neutering
you mustn't be neutering
he mustn't be neutering
we mustn't be neutering
you mustn't be neutering
they mustn't be neutering	I mustn't have neutered
you mustn't have neutered
he mustn't have neutered
we mustn't have neutered
you mustn't have neutered
they mustn't have neutered	I mustn't have been neutering
you mustn't have been neutering
he mustn't have been neutering
we mustn't have been neutering
you mustn't have been neutering
they mustn't have been neutering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I neuter?
must you neuter?
must he neuter?
must we neuter?
must you neuter?
must they neuter? 	must I be neutering?
must you be neutering?
must he be neutering?
must we be neutering?
must you be neutering?
must they be neutering? 	must I have neutered?
must you have neutered?
must he have neutered?
must we have neutered?
must you have neutered?
must they have neutered? 	must I have been neutering?
must you have been neutering?
must he have been neutering?
must we have been neutering?
must you have been neutering?
must they have been neutering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I neuter?
mustn't you neuter?
mustn't he neuter?
mustn't we neuter?
mustn't you neuter?
mustn't they neuter? 	mustn't I be neutering?
mustn't you be neutering?
mustn't he be neutering?
mustn't we be neutering?
mustn't you be neutering?
mustn't they be neutering? 	mustn't I have neutered?
mustn't you have neutered?
mustn't he have neutered?
mustn't we have neutered?
mustn't you have neutered?
mustn't they have neutered? 	mustn't I have been neutering?
mustn't you have been neutering?
mustn't he have been neutering?
mustn't we have been neutering?
mustn't you have been neutering?
mustn't they have been neutering?