could sulfurize
Verbo regular: sulfurize - sulfurized- sulfurized

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could sulfurize
you could sulfurize
he could sulfurize
we could sulfurize
you could sulfurize
they could sulfurize 	I could be sulfurizing
you could be sulfurizing
he could be sulfurizing
we could be sulfurizing
you could be sulfurizing
they could be sulfurizing	I could have sulfurized
you could have sulfurized
he could have sulfurized
we could have sulfurized
you could have sulfurized
they could have sulfurized	I could have been sulfurizing
you could have been sulfurizing
he could have been sulfurizing
we could have been sulfurizing
you could have been sulfurizing
they could have been sulfurizing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't sulfurize
you couldn't sulfurize
he couldn't sulfurize
we couldn't sulfurize
you couldn't sulfurize
they couldn't sulfurize 	I couldn't be sulfurizing
you couldn't be sulfurizing
he couldn't be sulfurizing
we couldn't be sulfurizing
you couldn't be sulfurizing
they couldn't be sulfurizing	I couldn't have sulfurized
you couldn't have sulfurized
he couldn't have sulfurized
we couldn't have sulfurized
you couldn't have sulfurized
they couldn't have sulfurized	I couldn't have been sulfurizing
you couldn't have been sulfurizing
he couldn't have been sulfurizing
we couldn't have been sulfurizing
you couldn't have been sulfurizing
they couldn't have been sulfurizing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I sulfurize?
could you sulfurize?
could he sulfurize?
could we sulfurize?
could you sulfurize?
could they sulfurize? 	could I be sulfurizing?
could you be sulfurizing?
could he be sulfurizing?
could we be sulfurizing?
could you be sulfurizing?
could they be sulfurizing? 	could I have sulfurized?
could you have sulfurized?
could he have sulfurized?
could we have sulfurized?
could you have sulfurized?
could they have sulfurized? 	could I have been sulfurizing?
could you have been sulfurizing?
could he have been sulfurizing?
could we have been sulfurizing?
could you have been sulfurizing?
could they have been sulfurizing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I sulfurize?
couldn't you sulfurize?
couldn't he sulfurize?
couldn't we sulfurize?
couldn't you sulfurize?
couldn't they sulfurize? 	couldn't I be sulfurizing?
couldn't you be sulfurizing?
couldn't he be sulfurizing?
couldn't we be sulfurizing?
couldn't you be sulfurizing?
couldn't they be sulfurizing? 	couldn't I have sulfurized?
couldn't you have sulfurized?
couldn't he have sulfurized?
couldn't we have sulfurized?
couldn't you have sulfurized?
couldn't they have sulfurized? 	couldn't I have been sulfurizing?
couldn't you have been sulfurizing?
couldn't he have been sulfurizing?
couldn't we have been sulfurizing?
couldn't you have been sulfurizing?
couldn't they have been sulfurizing?