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 must not vulcanize
you must not vulcanize
she must not vulcanize
we must not vulcanize
you must not vulcanize
they must not vulcanize 	I must not be vulcanizing
you must not be vulcanizing
she must not be vulcanizing
we must not be vulcanizing
you must not be vulcanizing
they must not be vulcanizing	I must not have vulcanized
you must not have vulcanized
she must not have vulcanized
we must not have vulcanized
you must not have vulcanized
they must not have vulcanized	I must not have been vulcanizing
you must not have been vulcanizing
she must not have been vulcanizing
we must not have been vulcanizing
you must not have been vulcanizing
they must not 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 	
must I not vulcanize?
must you not vulcanize?
must she not vulcanize?
must we not vulcanize?
must you not vulcanize?
must they not vulcanize? 	must I not be vulcanizing?
must you not be vulcanizing?
must she not be vulcanizing?
must we not be vulcanizing?
must you not be vulcanizing?
must they not be vulcanizing? 	must I not have vulcanized?
must you not have vulcanized?
must she not have vulcanized?
must we not have vulcanized?
must you not have vulcanized?
must they not have vulcanized? 	must I not have been vulcanizing?
must you not have been vulcanizing?
must she not have been vulcanizing?
must we not have been vulcanizing?
must you not have been vulcanizing?
must they not have been vulcanizing?