must vulcanize
Verbo regular: vulcanize - vulcanized- vulcanized

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must vulcanize
you must vulcanize
he must vulcanize
we must vulcanize
you must vulcanize
they must vulcanize 	I must be vulcanizing
you must be vulcanizing
he must be vulcanizing
we must be vulcanizing
you must be vulcanizing
they must be vulcanizing	I must have vulcanized
you must have vulcanized
he 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
he must have been vulcanizing
we must have been vulcanizing
you must have been vulcanizing
they must have been vulcanizing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not vulcanize
you must not vulcanize
he 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
he 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
he 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
he must not have been vulcanizing
we must not have been vulcanizing
you must not have been vulcanizing
they must not have been vulcanizing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I vulcanize?
must you vulcanize?
must he vulcanize?
must we vulcanize?
must you vulcanize?
must they vulcanize? 	must I be vulcanizing?
must you be vulcanizing?
must he be vulcanizing?
must we be vulcanizing?
must you be vulcanizing?
must they be vulcanizing? 	must I have vulcanized?
must you have vulcanized?
must he 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 he have been vulcanizing?
must we have been vulcanizing?
must you have been vulcanizing?
must they have been vulcanizing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not vulcanize?
must you not vulcanize?
must he 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 he 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 he 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 he not have been vulcanizing?
must we not have been vulcanizing?
must you not have been vulcanizing?
must they not have been vulcanizing?