could desulferise
Regular verb: desulferise - desulferised- desulferised

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could desulferise
you could desulferise
he could desulferise
we could desulferise
you could desulferise
they could desulferise 	I could be desulferising
you could be desulferising
he could be desulferising
we could be desulferising
you could be desulferising
they could be desulferising	I could have desulferised
you could have desulferised
he could have desulferised
we could have desulferised
you could have desulferised
they could have desulferised	I could have been desulferising
you could have been desulferising
he could have been desulferising
we could have been desulferising
you could have been desulferising
they could have been desulferising	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't desulferise
you couldn't desulferise
he couldn't desulferise
we couldn't desulferise
you couldn't desulferise
they couldn't desulferise 	I couldn't be desulferising
you couldn't be desulferising
he couldn't be desulferising
we couldn't be desulferising
you couldn't be desulferising
they couldn't be desulferising	I couldn't have desulferised
you couldn't have desulferised
he couldn't have desulferised
we couldn't have desulferised
you couldn't have desulferised
they couldn't have desulferised	I couldn't have been desulferising
you couldn't have been desulferising
he couldn't have been desulferising
we couldn't have been desulferising
you couldn't have been desulferising
they couldn't have been desulferising	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I desulferise?
could you desulferise?
could he desulferise?
could we desulferise?
could you desulferise?
could they desulferise? 	could I be desulferising?
could you be desulferising?
could he be desulferising?
could we be desulferising?
could you be desulferising?
could they be desulferising? 	could I have desulferised?
could you have desulferised?
could he have desulferised?
could we have desulferised?
could you have desulferised?
could they have desulferised? 	could I have been desulferising?
could you have been desulferising?
could he have been desulferising?
could we have been desulferising?
could you have been desulferising?
could they have been desulferising? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I desulferise?
couldn't you desulferise?
couldn't he desulferise?
couldn't we desulferise?
couldn't you desulferise?
couldn't they desulferise? 	couldn't I be desulferising?
couldn't you be desulferising?
couldn't he be desulferising?
couldn't we be desulferising?
couldn't you be desulferising?
couldn't they be desulferising? 	couldn't I have desulferised?
couldn't you have desulferised?
couldn't he have desulferised?
couldn't we have desulferised?
couldn't you have desulferised?
couldn't they have desulferised? 	couldn't I have been desulferising?
couldn't you have been desulferising?
couldn't he have been desulferising?
couldn't we have been desulferising?
couldn't you have been desulferising?
couldn't they have been desulferising?