could vulcanize
Verbo regular: vulcanize - vulcanized- vulcanized

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

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't vulcanize
you couldn't vulcanize
he couldn't vulcanize
we couldn't vulcanize
you couldn't vulcanize
they couldn't vulcanize 	I couldn't be vulcanizing
you couldn't be vulcanizing
he couldn't be vulcanizing
we couldn't be vulcanizing
you couldn't be vulcanizing
they couldn't be vulcanizing	I couldn't have vulcanized
you couldn't have vulcanized
he couldn't have vulcanized
we couldn't have vulcanized
you couldn't have vulcanized
they couldn't have vulcanized	I couldn't have been vulcanizing
you couldn't have been vulcanizing
he couldn't have been vulcanizing
we couldn't have been vulcanizing
you couldn't have been vulcanizing
they couldn't have been vulcanizing	

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

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I vulcanize?
couldn't you vulcanize?
couldn't he vulcanize?
couldn't we vulcanize?
couldn't you vulcanize?
couldn't they vulcanize? 	couldn't I be vulcanizing?
couldn't you be vulcanizing?
couldn't he be vulcanizing?
couldn't we be vulcanizing?
couldn't you be vulcanizing?
couldn't they be vulcanizing? 	couldn't I have vulcanized?
couldn't you have vulcanized?
couldn't he have vulcanized?
couldn't we have vulcanized?
couldn't you have vulcanized?
couldn't they have vulcanized? 	couldn't I have been vulcanizing?
couldn't you have been vulcanizing?
couldn't he have been vulcanizing?
couldn't we have been vulcanizing?
couldn't you have been vulcanizing?
couldn't they have been vulcanizing?