English verb conjugation
COULD DESULFERIZE

Regular verb: desulferize - desulferized - desulferized

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
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
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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?