could desulferize
Regular verb: desulferize - desulferized- desulferized

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could desulferize
you could desulferize
he could desulferize
we could desulferize
you could desulferize
they could desulferize 	I could be desulferizing
you could be desulferizing
he could be desulferizing
we could be desulferizing
you could be desulferizing
they could be desulferizing	I could have desulferized
you could have desulferized
he could have desulferized
we could have desulferized
you could have desulferized
they could have desulferized	I could have been desulferizing
you could have been desulferizing
he could have been desulferizing
we could have been desulferizing
you could have been desulferizing
they could have been desulferizing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't desulferize
you couldn't desulferize
he couldn't desulferize
we couldn't desulferize
you couldn't desulferize
they couldn't desulferize 	I couldn't be desulferizing
you couldn't be desulferizing
he couldn't be desulferizing
we couldn't be desulferizing
you couldn't be desulferizing
they couldn't be desulferizing	I couldn't have desulferized
you couldn't have desulferized
he couldn't have desulferized
we couldn't have desulferized
you couldn't have desulferized
they couldn't have desulferized	I couldn't have been desulferizing
you couldn't have been desulferizing
he couldn't have been desulferizing
we couldn't have been desulferizing
you couldn't have been desulferizing
they couldn't have been desulferizing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I desulferize?
could you desulferize?
could he desulferize?
could we desulferize?
could you desulferize?
could they desulferize? 	could I be desulferizing?
could you be desulferizing?
could he be desulferizing?
could we be desulferizing?
could you be desulferizing?
could they be desulferizing? 	could I have desulferized?
could you have desulferized?
could he have desulferized?
could we have desulferized?
could you have desulferized?
could they have desulferized? 	could I have been desulferizing?
could you have been desulferizing?
could he have been desulferizing?
could we have been desulferizing?
could you have been desulferizing?
could they have been desulferizing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I desulferize?
couldn't you desulferize?
couldn't he desulferize?
couldn't we desulferize?
couldn't you desulferize?
couldn't they desulferize? 	couldn't I be desulferizing?
couldn't you be desulferizing?
couldn't he be desulferizing?
couldn't we be desulferizing?
couldn't you be desulferizing?
couldn't they be desulferizing? 	couldn't I have desulferized?
couldn't you have desulferized?
couldn't he have desulferized?
couldn't we have desulferized?
couldn't you have desulferized?
couldn't they have desulferized? 	couldn't I have been desulferizing?
couldn't you have been desulferizing?
couldn't he have been desulferizing?
couldn't we have been desulferizing?
couldn't you have been desulferizing?
couldn't they have been desulferizing?