must vulcanize
Regular verb: vulcanize - vulcanized- vulcanized

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must vulcanize
you must vulcanize
she must vulcanize
we must vulcanize
you must vulcanize
they must vulcanize 	I must be vulcanizing
you must be vulcanizing
she must be vulcanizing
we must be vulcanizing
you must be vulcanizing
they must be vulcanizing	I must have vulcanized
you must have vulcanized
she must have vulcanized
we must have vulcanized
you must have vulcanized
they must have vulcanized	I must have been vulcanizing
you must have been vulcanizing
she must have been vulcanizing
we must have been vulcanizing
you must have been vulcanizing
they must have been vulcanizing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't vulcanize
you mustn't vulcanize
she mustn't vulcanize
we mustn't vulcanize
you mustn't vulcanize
they mustn't vulcanize 	I mustn't be vulcanizing
you mustn't be vulcanizing
she mustn't be vulcanizing
we mustn't be vulcanizing
you mustn't be vulcanizing
they mustn't be vulcanizing	I mustn't have vulcanized
you mustn't have vulcanized
she mustn't have vulcanized
we mustn't have vulcanized
you mustn't have vulcanized
they mustn't have vulcanized	I mustn't have been vulcanizing
you mustn't have been vulcanizing
she mustn't have been vulcanizing
we mustn't have been vulcanizing
you mustn't have been vulcanizing
they mustn't have been vulcanizing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I vulcanize?
must you vulcanize?
must she vulcanize?
must we vulcanize?
must you vulcanize?
must they vulcanize? 	must I be vulcanizing?
must you be vulcanizing?
must she be vulcanizing?
must we be vulcanizing?
must you be vulcanizing?
must they be vulcanizing? 	must I have vulcanized?
must you have vulcanized?
must she have vulcanized?
must we have vulcanized?
must you have vulcanized?
must they have vulcanized? 	must I have been vulcanizing?
must you have been vulcanizing?
must she have been vulcanizing?
must we have been vulcanizing?
must you have been vulcanizing?
must they have been vulcanizing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I vulcanize?
mustn't you vulcanize?
mustn't she vulcanize?
mustn't we vulcanize?
mustn't you vulcanize?
mustn't they vulcanize? 	mustn't I be vulcanizing?
mustn't you be vulcanizing?
mustn't she be vulcanizing?
mustn't we be vulcanizing?
mustn't you be vulcanizing?
mustn't they be vulcanizing? 	mustn't I have vulcanized?
mustn't you have vulcanized?
mustn't she have vulcanized?
mustn't we have vulcanized?
mustn't you have vulcanized?
mustn't they have vulcanized? 	mustn't I have been vulcanizing?
mustn't you have been vulcanizing?
mustn't she have been vulcanizing?
mustn't we have been vulcanizing?
mustn't you have been vulcanizing?
mustn't they have been vulcanizing?