could sulfate
Verbo regular: sulfate - sulfated- sulfated

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could sulfate
you could sulfate
he could sulfate
we could sulfate
you could sulfate
they could sulfate 	I could be sulfating
you could be sulfating
he could be sulfating
we could be sulfating
you could be sulfating
they could be sulfating	I could have sulfated
you could have sulfated
he could have sulfated
we could have sulfated
you could have sulfated
they could have sulfated	I could have been sulfating
you could have been sulfating
he could have been sulfating
we could have been sulfating
you could have been sulfating
they could have been sulfating	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not sulfate
you could not sulfate
he could not sulfate
we could not sulfate
you could not sulfate
they could not sulfate 	I could not be sulfating
you could not be sulfating
he could not be sulfating
we could not be sulfating
you could not be sulfating
they could not be sulfating	I could not have sulfated
you could not have sulfated
he could not have sulfated
we could not have sulfated
you could not have sulfated
they could not have sulfated	I could not have been sulfating
you could not have been sulfating
he could not have been sulfating
we could not have been sulfating
you could not have been sulfating
they could not have been sulfating	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I sulfate?
could you sulfate?
could he sulfate?
could we sulfate?
could you sulfate?
could they sulfate? 	could I be sulfating?
could you be sulfating?
could he be sulfating?
could we be sulfating?
could you be sulfating?
could they be sulfating? 	could I have sulfated?
could you have sulfated?
could he have sulfated?
could we have sulfated?
could you have sulfated?
could they have sulfated? 	could I have been sulfating?
could you have been sulfating?
could he have been sulfating?
could we have been sulfating?
could you have been sulfating?
could they have been sulfating? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not sulfate?
could you not sulfate?
could he not sulfate?
could we not sulfate?
could you not sulfate?
could they not sulfate? 	could I not be sulfating?
could you not be sulfating?
could he not be sulfating?
could we not be sulfating?
could you not be sulfating?
could they not be sulfating? 	could I not have sulfated?
could you not have sulfated?
could he not have sulfated?
could we not have sulfated?
could you not have sulfated?
could they not have sulfated? 	could I not have been sulfating?
could you not have been sulfating?
could he not have been sulfating?
could we not have been sulfating?
could you not have been sulfating?
could they not have been sulfating?